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Webster 1913 Edition

Adj.

Conquered; overpowered; crushed; submissive; mild.

Not glaring in color; soft in tone.

pp.

Conquered and reduced to subjection; oppressed; crushed; tamed; softened.

subdued ‎(comparative more subdued, superlative most subdued)

Conquered; overpowered; crushed; submissive; mild.
He is subdued after the disagreement last night.‎
- 1603, William Shakespeare, “The Tragedie of Othello, the Moore of Venice”, in Mr. William Shakespeares Comedies, Histories, & Tragedies: Published According to the True Originall Copies, London: Printed by Isaac Iaggard, and Ed[ward] Blount, published 1623, OCLC 606515358, Act V, scene ii, page 338:
  I pray you in your Letters, / When you ſhall theſe vnluckie deeds relate, / Speake of me, as I am. […] / Of one, whoſe ſubdu'd Eyes, / Albeit un-vsed to the melting moode, / Drops teares as faſt as the Arabian Trees / Their Medicinable gumme.
Not glaring in color; soft and light in tone.
The colour scheme used for this room is subdued.‎

Conquered; overpowered; crushed; submissive; mild

Not glaring in color; soft in tone

subdued

simple past tense and past participle of subdue
He subdued the dog yesterday.