From Middle English sotilte, from Old French sutilté, inherited from Latin subtīlitās, from subtīlis ("subtle").

• IPA: /ˈsʌt(ə)lti/

subtlety

1. (uncountable) The quality of being subtle.
   1. The quality of being scarcely noticeable or difficult to discern. (of things)

      the subtlety of the Mona Lisa’s smile

      • 1964, Saul Bellow, Herzog, New York: Viking Press, pages 248–249 ↗:

        […] he had a lifetime of skill in interpreting his father’s gestures: those bent knees meant that something of great subtlety was about to be revealed.

   2. The quality of being done in a clever way that is not obvious or not direct; the quality of being carefully thought out. (of things)

      Synonyms: refinement

      the subtlety of a writer’s analysis / of a singer’s phrasing

   3. The quality of being able to achieve one's aims through clever, delicate or indirect methods. (of people)

      Synonyms: discretion, finesse, savoir-faire

      With all his usual subtlety, he quietly fixed the problem before anyone else noticed it.

      • 1979, William Styron, chapter 3, in Sophie's Choice‎, New York: Random House, page 74:

        European women often boss their men too, but with a beguiling subtlety unknown to most American females.

   4. The quality of being able to notice or understand things that are not obvious. (of people)

      Synonyms: acumen, perceptiveness, perspicacity

      • 1611, The Holy Bible, […] (King James Version), London: […] Robert Barker, […], →OCLC ↗, Proverbs 1:4 ↗:

        To give subtilty to the simple, to the young man knowledge and discretion.

2. (countable) An instance of being subtle, a subtle thing, especially a subtle argument or distinction.

   Synonyms: nicety, nuance

   The subtleties of this overture are often overlooked.

   • 1561, William Whittingham et al. (translators), Geneva Bible, Book of Wisdom 8.8,

     […] she [Wisdom] knoweth the subtilties of wordes, and the solutions of darke sentences:

   • 1661, Robert Boyle, “Physiological Considerations Touching the Experiments Wont to be Employed to Evince either the IV Peripatetick Elements, or the III Chymical Principls of Mixt Bodies. Part of the First Dialogue.”, in The Sceptical Chymist: or Chymico-physical Doubts & Paradoxes, […], London: […] J. Cadwell for J. Crooke, […], →OCLC ↗, pages 14–15 ↗:

     For I, and no doubt You, have long obſerved, that thoſe Dialectical ſubtleties, that the Schoolmen too often employ about Phyſiological Myſteries, are vvont much more to declare the vvit of him that uſes them, then increaſe the knovvledge or remove the doubts of ſober lovers of truth. And such captious ſubtleties do indeed often puzzle and ſometimes ſilence men, but rarely ſatisfy them.

   • 1779, David Hume, Dialogues Concerning Natural Religion‎, Part 10, p. 112:

     It is your turn now […] to support your philosophical subtilties against the dictates of plain reason and experience.

   • 1886 May – 1887 April, Thomas Hardy, chapter VI, in The Woodlanders […], volume II, London; New York, N.Y.: Macmillan and Co., published 1887, →OCLC ↗, page 104 ↗:

     She could not explain the subtleties of her feeling as clearly as he could state his opinion, even though she had skill in speech, and her father had none.

   • 1952 September 19, John Steinbeck, chapter 36, in East of Eden, New York, N.Y.: The Viking Press, →OCLC ↗, book 4, page 422 ↗:

     His body was as insensitive to pain as was his mind to subtleties.

3. (countable, historical) An ornate medieval illusion dish or table decoration, especially when made from one thing but crafted to look like another.

   At the king's coronation feast, several subtleties were served between main courses.

4. (uncountable, countable, archaic) The quality of being clever in surreptitious or deceitful behaviour; an act or argument that shows this quality.

   Synonyms: artifice, craftiness, cunning, deceitfulness, slyness, trickery

   • c. 1580 (date written), Philippe Sidnei [i.e., Philip Sidney], “(please specify the folio)”, in [Fulke Greville; Matthew Gwinne; John Florio], editors, The Countesse of Pembrokes Arcadia [The New Arcadia], London: […] [John Windet] for William Ponsonbie, published 1590, →OCLC ↗:

     [She] resolued now with plainnesse to winne trust, which trust she might after deceyue with a greater subtletie.

   • 1611, The Holy Bible, […] (King James Version), London: […] Robert Barker, […], →OCLC ↗, 2 Corinthians 11:3 ↗:

     But I fear, lest by any means, as the serpent beguiled Eve through his subtilty, so your minds should be corrupted from the simplicity that is in Christ.

   • 1715–1720, Homer, translated by Alexander Pope, “(please specify the book of the Iliad or chapter quoted from)”, in The Iliad of Homer, volume (please specify |volume=I to VI), London: […] W[illiam] Bowyer, for Bernard Lintott […], →OCLC ↗, page 136 ↗:

     […] the Spy was deceiv’d rather by the Art and Subtlety of Ulysses, than by his Falshood.

   • 1817 (date written), [Jane Austen], chapter X, in Persuasion; published in Northanger Abbey: And Persuasion. […], volume (please specify |volume=III or IV), London: John Murray, […], 20 December 1817 (indicated as 1818), →OCLC ↗, page 220 ↗:

     Mr. Elliot’s subtleties, in endeavouring to prevent [the marriage]

5. (countable, obsolete) A trick that creates a false appearance.

   Synonyms: deception, illusion

   • 1610–1611 (date written), William Shakespeare, “The Tempest”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC ↗, [Act V, scene i]:

     You doe yet taste
     Some subtleties o’ th’ Isle, that will not let you
     Beleeue things certaine:

6. (uncountable, obsolete) The property of having a low density or thin consistency.
   • 1630, Thomas Johnson (botanist) (translator/editor), A Treatise of the Plague […] Collected out of the workes of […] Ambroise Paré, London, Chapter 11, p. 33,

     Therefore at Paris where naturally, and also through the aboundance of filth that is about the Citie, the Aire is darke and grosse, the pestilent Infection is lesse fierce and contagious then it is in Prouince, for the subtletie of the Aire stimulates or helps forward the Plague.

7. (uncountable, obsolete) The property of being able to penetrate materials easily.

   Synonyms: penetrancy, piercingness

   • 1760, John Wesley, The Desideratum; or, Electricity Made Plain and Useful‎, London, pages 37–38:

     Hence we see the amazing Subtlety of this Fire, which pervades Glass as readily as if nothing were in the Way.

• French: subtilité
• German: Geschicklichkeit, Feinheit, Feinsinn, Feinsinnigkeit, Raffinesse, Raffiniertheit, Scharfsinn, Scharfsinnigkeit, Subtilität, Zartheit
• Italian: sottigliezza
• Portuguese: sutileza (Brazil), subtileza (Portugal)
• Russian: то́нкость
• Spanish: delicadeza, sutileza

• Portuguese: sutileza (Brazil), subtileza (Portugal)
• Spanish: sutileza

• French: entremets