• (RP) IPA: /ˈbaʊnd(ə)n/
• (GA) IPA: /ˈbaʊndən/

bounden

1. (dated) Now chiefly in the term bounden duty: made obligatory; binding#Adjective|binding.
   • 1549 March 16, Thomas Cranmer [et al.], compilers, “The Supper of the Lorde, and the Holy Communion, Commonly Called the Masse”, in The Booke of the Common Prayer and Administration of the Sacramentes, […], London: In officina Edowardi Whitchurche […], OCLC 56485293 ↗, folio cxxix, recto ↗:

     And although we be vnworthy (through our manyfolde ſynnes) to offre vnto thee any Sacryfice: Yet we beſeche thee to accepte thys our bounden duetie and ſeruice: and commande theſe our prayers and ſupplicacions, by the Miniſtery of thy holy Angels, to be brought vp into thy holy Tabernacle before the ſyght of thy dyuine maieſtie: {{...}

   • 1814 July 6, [Walter Scott], chapter XIX, in Waverley; or, ’Tis Sixty Years Since. In Three Volumes, volume III, Edinburgh: Printed by James Ballantyne and Co. for Archibald Constable and Co.; London: Longman, Hurst, Rees, Orme, and Brown, OCLC 270129598 ↗, page 282 ↗:

     That I wad wi' a' my heart; and mickle obliged to your honour for putting me in mind o' my bounden duty.

   • 1847 January – 1848 July​, William Makepeace Thackeray, “Miss Crawley at Nurse”, in Vanity Fair. A Novel without a Hero, London: Bradbury and Evans, […], published 1848, OCLC 3174108 ↗, page 165 ↗:

     She imparted these stories gradually to Miss Crawley; gave her the whole benefit of them; felt it to be her bounden duty as a Christian woman and mother of a family to do so; had not the smallest remorse or compunction for the victim whom her tongue was immolating; nay, very likely thought her act was quite meritorious, and plumed herself upon her resolute manner of performing it.

2. (obsolete) Bound.

1. (transitive, archaic, rare) Past participle of bind.

   Synonyms: bound, ybounden

   Antonyms: unbounden

   1. (intransitive, archaic, specifically) To be obliged#Adjective|obliged; to be under a duty or obligation (to do something).
      • c. 1596, William Shakespeare, “The Life and Death of King Iohn”, in Mr. William Shakespeares Comedies, Histories, & Tragedies: Published According to the True Originall Copies (First Folio), London: Printed by Isaac Iaggard, and Ed[ward] Blount, published 1623, OCLC 606515358 ↗, [Act III, scene iii], page 11 ↗, column 2:

        I am much bounden to your Maieſty.