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Definition of improper:

  1. Not according to facts; inaccurate; erroneous.
  2. Not peculiar or appropriate to individuals; general; common.
  3. Not proper; not suitable; not fitted to the circumstances, design, or end; unfit; not becoming; incongruous; inappropriate; indecent; as, an improper medicine; improper thought, behavior, language, dress.
  4. To appropriate; to limit.


incorrect, ludicrous, illegitimate, unconventional, awry, outlawed, wrongful, unlawful, unwarranted, awkward, irregular, agree, unsuitable, unapt, inept, naughty, untimely, indecorous, haywire, inadvisable, inapplicable, inexpedient, unapt, unseasonable, naughty, smutty, illicit, amiss, undue, immodest, out-of-the-way, untoward, inopportune, inharmonious, discordant, usual, uncomely, outlaw, wrong, imprudent, discrepant, suggestive, immodest, ill-timed, lewd, ill-advised, preposterous, inappropriate, indecent, unbecoming, unseemly.

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