Antonyms for proper
all:
improper.
conventional, correct:
false,
questionable,
careless.
mannerly, decent:
inaccurate,
bad,
imprecise,
inexact,
corrupt,
dishonest.
suitable:
unfitting,
improper,
unsuited,
crude,
objectionable,
substandard,
unsuitable,
incorrect,
general,
unacceptable,
Misbehaving,
inappropriate,
unseemly,
crass,
unconventional.
noun:
grungy,
defective,
imperfect,
uncharacteristic,
inapplicable,
Unbeseeming,
laid-back,
incompatible,
casual,
flawed,
inexpert,
inadequate,
unskilled,
intolerable,
faulty,
incompetent,
atypical,
Unmeet,
unacceptable,
unsatisfactory,
unfitting,
ungraceful,
uncongenial,
incapable,
seedy,
unreal,
tacky,
Misbecoming,
shabby,
awkward,
rude,
gauche,
untrained,
nonspecific,
unskillful,
untypical,
easygoing,
unqualified.