From Middle English seely, sēlī, from Old English sǣliġ, ġesǣliġ, from Proto-West Germanic *sālīg, from *sāli.

The semantic evolution is “lucky” → “innocent” → “naïve” → “foolish”. Compare the similar evolution of daft (originally meaning “accommodating”), and almost the reverse with nice (originally meaning “ignorant”).

• IPA: /ˈsɪli/

silly (comparative sillier, superlative silliest)

1. Laughable or amusing through foolishness or a foolish appearance.
   • c. 1595–1596 (date written), William Shakespeare, “A Midsommer Nights Dreame”, in Mr. William Shakespeares Comedies, Histories, & Tragedies: Published According to the True Originall Copies (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC ↗, [Act V, scene i], line 209:

     This is the silliest stuffe, that euer I heard.

   • 1726 October 27, [Jonathan Swift], Travels into Several Remote Nations of the World. […] [Gulliver's Travels], volume I, London: […] Benj[amin] Motte, […], →OCLC ↗, part I (A Voyage to Lilliput), pages 226–227 ↗:

     I remember, before the Dwarf left the Queen, he followed us one day into thoſe gardens, and my Nurſe having ſet me down, he and I being cloſe together, near ſome Dwarf Apple trees, I muſt need ſhew my Wit, by a ſilly Alluſion between him and the Trees, which happens to hold in their Language as it doth in ours.

   • 1970, Graham Chapman et al., Monty Python's Flying Circus, I, 183:

     Well sir, I have a silly walk and I'd like to obtain a Government grant to help me develop it.

   1. (of numbers, particularly prices) Absurdly large.
      • 1875 June 26, Saturday Review, 815/2:

        He cannot achieve celebrity by covering himself with diamonds... or by giving a silly price for a hack.

2. (chiefly, Scottish, obsolete) Blessed, particularly:
   1. Good; pious.
      • a. 1450, Seven Sages, line 1361:

        The sylyman lay and herde,
        And hys wyf answerd.

   2. Holy.
      • 1650 in 1885, W. Cramond, Church of Rathven, 21:

        ... thrie Saturdayes befor Lambas and thrie efter called the six silie Saturdayes.

3. (now, chiefly, Scottish and northern England, rare) Pitiful, inspiring compassion, particularly:
   • 1556 in 1880, William Henry Turner, Selections from the Records of the City of Oxford... 1509–83, 246:

     The fire raging upon the silly Carcase.

   1. (now, literary) Innocent; suffering undeservedly, especially as an epithet of lambs and sheep.
      • a. 1475, in 1925, Rossell Hope Robbins, Secular Lyrics of the 14th & 15th Centuries, 109:

        There is no best in þe word, I wene...
        That suffuris halfe so myche tene
        As doth þe sylly wat.

      • a. 1513, William Dunbar, Poems, section 247:

        In the silly lambis skin He crap als far as he micht win.

   2. (now, literary) Helpless, defenseless.

      scared silly

      • 1539, Juan Luis Vives, translated by Richard Morison, Introduction to Wysedome:

        Wherfore Christe must soo moche the more instantelye be sought vpon, that he may vouchsafe to defende vs sylly wretches.

      • c. 1587–1588, [Christopher Marlowe], Tamburlaine the Great. […] The First Part […], 2nd edition, part 1, London: […] [R. Robinson for] Richard Iones, […], published 1592, →OCLC ↗; reprinted as Tamburlaine the Great (A Scolar Press Facsimile), Menston, Yorkshire, London: Scolar Press, 1973, →ISBN, Act I, scene ii ↗:

        Ah Shepheard, pity my diſtreſſed plight,
        (If as thou ſeem’ſt, thou art ſo meane a man)
        And ſeeke not to inrich thy followers,
        By lawleſſe rapine from a ſilly maide, […]

      • 1665, Hugo Grotius, translated by Thomas Manley, De Rebus Belgicis, section 938:

        There remained fresh Examples of their Barbarism against weak Sea-men, and silly Fisher-men.

   3. Insignificant, worthless, (chiefly, Scottish) especially with regard to land quality.
      • a. 1500, Aesop, translated by Robert Henryson, Two Mice:

        Ane sillie scheill vnder ane erdfast stane

      • c. 1591–1592 (date written), William Shakespeare, “The Third Part of Henry the Sixt, […]”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC ↗, [Act III, scene iii], line 93:

        […] A pettigree
        Of threescore and two yeares a sillie time,
        To make prescription for a kingdomes worth.

      • 1907, Transactions of the Highland & Agricultural Society, 19, 172:

        It is naturally very poor, ‘silly’ land.

   4. Weak, frail; flimsy (use concerning people and animals is now obsolete).
      • 1567, John Maplet, A Greene Forest:

        Here we see that a smal sillie Bird knoweth how to match with so great a Beast.

      • 1587, Philippe de Mornay, translated by Philip Sidney et al., A Woorke Concerning the Trewnesse of the Christian Religion, xxxii, 596:

        [Christ] leaueth neither Children nor kinsfolke behind him to vphold his sillie kingdome.

      • 1946, Scottish National Dictionary, published 1971, Vol. VIII, 234/3:

        That'll never grow. It's ower silly.

   5. Sickly; feeble; infirm.
      • 1636, Alexander Montgomerie, The Cherrie & the Slae, line 1512:

        To doe the thing we can
        To please...
        This silly sickly man.

      • 1818, Heart of Mid-Lothian, Walter Scott, section V:

        Is there ony thing you would particularly fancy, as your health seems but silly?

4. (now, rural UK, rare) Simple, plain, particularly:
   1. Rustic, homely.
      • 1570, John Foxe, Actes & Monumentes, Vol. II, 926/1:

        Dauid had no more but a sylie slynge, and a few stones.

   2. (obsolete) Lowly, of humble station.
      • a. 1547, the Earl of Surrey translating Publius Virgilius Maro, Certain Bokes of Virgiles Aeneis, Book II:

        The silly herdman all astonnied standes.

      • 1568, Alexander Scott, Poems, section 27:

        So luvaris lair no leid suld lak,
        A lord to lufe a silly lass.

5. Mentally simple, foolish, particularly:
   1. (obsolete) Rustic, uneducated, unlearned.
      • 1687, Jean de Thévenot, translated by Archibald Lovell, The Travels of Monsieur de Thevenot into the Levant, i, 2:

        From Hell (of which the silly people of the Country think the top of this hill to be the mouth).

   2. Thoughtless, lacking judgment.
      • 1576, Abraham Fleming translating Sulpicius, A Panoplie of Epistles, 24:

        Wee sillie soules, take the matter too too heauily.

      • 1841, Charles Dickens, Barnaby Rudge, iii, 252:

        ‘Heaven help this silly fellow,’ murmured the perplexed locksmith.

      • 1972, George Lucas et al., American Graffiti, section 8:

        Steve, don't be silly. I mean social intercourse.

   3. (Scottish) Mentally retarded.
      • 1568, Christis Kirk on Grene:

        Fow ȝellow ȝellow wes hir heid bot scho of lufe wes sillie.

      • 1814, Waverley, Walter Scott, III, xvi, 237:

        Davie's no just like other folk... but he's no sae silly as folk tak him for.

   4. Stupefied, senseless; stunned or dazed.
      • 1829 January 17, Lancaster Gazette:

        You say you were knocked silly—was that so?

      • 1907, John Millington Synge, Playboy of the Western World, iii, 64:

        Drinking myself silly...

      • 1942, J. Chodorov et al., Junior Miss, ii, i, 113:

        Well, Judy, now that you've scared me silly, what's so important?

6. (cricket, of a fielding position) Very close to the batsman, facing the bowler; closer than short.
   • 1862 July 4, Notts. Guardian:

     Carpenter now placed himself at silly-point for Grundy, who was playing very forward.

• (playful) charming
• Also see Thesaurus:foolish

• (antonym(s) of “playful”): pious

• French: sot, insensé, idiot, bête, fou, stupide
• German: doof, dumm
• Italian: sciocco
• Portuguese: bobo, tolo, ingénuo
• Russian: глу́пый
• Spanish: bobo, tonto, niñito

• French: idiot, fou, givré (slang), branque (slang), jeté (slang)
• Portuguese: irresponsável, infantil, bobo
• Spanish: infantil

• French: bébête, idiot, nunuche
• German: albern
• Portuguese: bobo
• Russian: глупышка
• Spanish: apayasado

• French: abruti
• Portuguese: semiconsciente, aéreo
• Spanish: semiaturdido

• French: idiot de, imbécile de
• Italian: sciocco
• Portuguese: simples
• Spanish: tontito, simple

silly (comparative sillier, superlative silliest)

1. (now, regional or colloquial) Sillily: in a silly manner.
   • 1731, Colley Cibber, Careless Husband, 7th edition, i, i, 21:

     If you did but see how silly a Man fumbles for an Excuse, when he's a little asham'd of being in Love.

silly (plural sillies)

1. (colloquial) A silly person.
   • 1807 May, Scots Magazine, 366/1:

     While they, poor sillies, bid good night,
     O' love an' bogles eerie.

2. (affectionate, gently pejorative) A term of address.
   • 1918 September, St. Nicholas, 972/2:

     ‘Come on, silly,’ said Nannie.

3. (colloquial) A mistake.

• German: Dummerchen
• Portuguese: bobo (Brazil), boba (Brazil)