1. (a.) Not proper; not appropriate; not fitted to the circumstances\, design, or end; unfit; not becoming; incongruous; inappropriate; indecent; as, an improper medicine; improper thought, behavior, language, dress.

2. (a.) Not peculiar or appropriate to individuals; general; common.

3. (a.) Not according to facts; inaccurate; erroneous.

4. (v. t.) To appropriate; to limit.

Doric aberrant abnormal abominable amiss arrant atrocious bad barbaric barbarous base black blamable blameworthy blooper boner boo-boo break cacophonous careless chintzy clumsy coarse corrupt corruption criminal crude damnable dark delinquent deviant disgraceful disorderly disruptive doggerel dysphemistic erroneous evil excessive execrable FALSE faulty faux pas flagitious flagrant foul fresh futile gaffe gauche graceless gross hardly the thing harsh heinous ignominious ill ill-adapted ill-advised ill-assorted ill-chosen ill-considered ill-fitted ill-matched ill-seasoned ill-sorted ill-suited ill-timed illegal immodest immoral impertinent impolite impolitic imprecise impropriety impure in bad taste inaccurate inadmissibility inadmissible inadvisable inapplicable inapposite inappropriate inapt inauspicious incompatible inconcinnate inconcinnous incongruous inconvenient incorrect incorrectness indecent indecorous indecorousness indecorum indelicate indiscreet inelegance inelegant inept inexact inexpedient infamous infelicitous inferior informal iniquitous inopportune intempestive intrusive invalid irregular irrelevant knavish lascivious late lewd loose low mal a propos maladjusted malapropos malevolent malodorous misbehaving misjoined mismatched mismated misplaced mistaken mistimed monstrous naughty nefarious not done not respectable not the thing objectionableness obscene off base off color off-base off-color offensive out of character out of joint out of keeping out of line out of phase out of place out of proportion out of season out of time out of tune out-of-line outlandish peccant premature rank reprehensible reprobate risque rough rowdy rowdyish rude ruffianly sacrilegious sassy scandalous shameful shameless sinful sinister slipshod slovenly solecism solecistic suggestive tactless tasteless terrible too late too soon unacceptableness unadapted unapt unbecoming unbecomingness unbefitting unbehaving unbeseeming uncalled-for unceremonious uncomely unconventional uncourtly uncouth undecorous undesirable undignified undue uneuphonious unfavorable unfelicitous unfit unfitted unfitting unforgivable unfortunate ungenteel ungodly ungraceful ungrammatic unhandy unhappy unhealthy unkind unlawful unlucky unmeet unmeetness unpardonable unpleasant unpolished unprofitable unpropitious unqualified unready unrefined unrighteous unripe unseasonable unseemliness unseemly unskillful unspeakable unsuitable unsuited untasteful untimely untoward untrue unwise unworthy vernacularism vicious vile villainous vulgar vulgarism