Synonyms for Quit:

adj.

ceased (adjective)
Stayed, halted, suspended, Refrained, interrupted, stopped, abandoned, broken, Paused, closed, Ceased, Culminated, discontinued, terminated, ended.

n.

leave off, knock off, move on, come away, draw out. attend, audit, absenteeism, walk out, entrance, enroll, give notice, attendance, absence, enrollment, board. get away, pull out, blow, push off, split, run, cut out, get off, approach, shove off, retire. swear off. stall, surcease, belay. pay, square, quits, even. quit (noun)
discontinue, relinquish, drop out, throw in the towel, depart, stop, resign, renounce, rid, chuck up the sponge, leave office, free, lay off, give up, take leave, step down, foreswear, cease, throw in.

v.

abandon (verb)
desert, relinquish, evacuate, drop, abandon, leave, vacate, forsake, surrender, abdicate, discontinue, defect, resign.
abandoned (verb)
discontinued, deserted, evacuated, resigned, forsaken, Vacated, Abdicated, dropped, relinquished, left, surrendered, abandoned, defected, Forsook.
ceased (verb)
Desisted, Remitted, broke.
departed (verb)
parted, departed, withdrawn, Fled, Decamped, exited, Embarked, Went, Withdrew, gone.
gave up (verb)
given up, gave up.
give up (verb)
desist, abandon, discontinue, resign, give up, withdraw, relinquish, stop, surrender, cease.
relinquish (verb)
disclaim, release, forgo, waive, disown, renounce, shed, capitulate.
stop doing something (verb)
discontinue, surcease, halt, give notice, abandon, leave off, knock off, leave, terminate, cease, end, desist, suspend.

Other synonyms:

demean, Demit, quits, comport. deport, belay. cut out, behave. square, stall, acquit. knock off, retire. even. run, split, blow. bear. carry. cease
surcease.
depart
get off, take leave, move on, get away.
drop out
give notice, drop out.
exit
exited.
leave
leave, push off, walk out, come away.
relinquish
Demit.
resign
step down.
shove off
shove off.
square
square.
step-down
step down.
stop
leave off, belay.
throw-in
throw in.
withdraw
Withdrew.

Usage examples for quit

  1. You wouldn't even quit when she told you to." – The Case and The Girl by Randall Parrish
  2. " Oh, quit it, Mother. – On With Torchy by Sewell Ford
  3. Day before yesterday morning, I wanted to quit – Red Fleece by Will Levington Comfort