Synonyms for Used:

adj.

applied (adjective)
employed, Operated, Exerted, utilized, practiced, functioned, useful, conducted, Served, practical, utilitarian, applied, Exercised.
hand-me-down (adjective)
hand-me-down.
secondhand (adjective)
worn, pre-owned, hand-me-down.
taken (adjective)
accepted.

n.

wont, Habituated, usual, accustomed. accustomed (noun)
habitual, suited, customary.
employed (noun)
discarded, rejected, adapted, accepted.
secondhand (noun)
worn, pre-owned, hand-me-down.
used (noun)
ill-used, old, utilised, in use, utilized, secondhand, put-upon, victimised, exploited, victimized.

v.

applied (verb)
implemented, effected.
dirty (verb)
dirty, grimy, squalid, filthy, unclean, messy, grubby, unhygienic, contaminated, unsanitary.
utilized (verb)
facilitated.

Other synonyms:

Habituated, worn. wont, accustomed. secondhand
pre-owned, secondhand.
worn
old.
Other relevant words:
utilised, accustomed, old, hand-me-down, adapted, worn, Habituated, secondhand, applied, victimized, wont, in use, victimised, put-upon, ill-used, exploited.

Usage examples for used

  1. I never used 'em. – Winter Fun by William O. Stoddard
  2. And this poet Lindstrum whom everybody was talking about, used to call on her. – Gargoyles by Ben Hecht
  3. You never used to go on like this. – The Getting of Wisdom by Henry Handel Richardson