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Related to improper: improperly, In proper, improper fractions
improperadjective amiss, awkward, contrary to deeency, contrary to good taste, discordant, discrepant, false, forbidden, gross, ill-adapted, ill-founded, illicit, illogical, immodest, immoral, inaccurate, inadmissible, inapplicable, inapposite, inappropriate, inapt, incongruous, incorrect, indecent, indecorous, indecorus, indignus, inept, inexact, infelicitous, inopportune, irrelevant, mistaken, naughty, not perrinent, not right, not suitable, objectionable, off-color, off the mark, out of place, prohibited, risque, unadapted, unallowable, unauthorized, unbecoming, unbefitting, undesirable, undue, unfit, unfitting, unmeet, unrefined, unseasonable, unseemly, unsound, unsuitable, unsuited, untimely, unwarrantable, wide of the mark, wrong, wrongful
Associated concepts: improper act, improper conduct, immroper discharge, improper influence, improper joinder ofactions, improper motive, improper performance, immroper practice, improper use
See also: bad, blatant, culpable, delinquent, disgraceful, disorderly, disreputable, drastic, excessive, false, faulty, illegal, illegitimate, illicit, immoral, impertinent, inaccurate, inadmissible, inapplicable, inapposite, inappropriate, inapt, incongruous, incorrect, inelegant, ineligible, inept, iniquitous, insolent, lascivious, nefarious, objectionable, obtrusive, offensive, perverse, profane, slipshod, suggestive, unauthorized, unbecoming, undesirable, undue, unfit, unjust, unprofessional, unseemly, unsuitable, untimely, unwarranted, vicious, wrongful