not proper; not strictly belonging, applicable, correct, etc.; erroneous: He drew improper conclusions from the scant evidence.
not in accordance with propriety of behavior, manners, etc.: improper conduct at a funeral.
unsuitable or inappropriate, as for the purpose or occasion: improper attire for a formal dance.
abnormal or irregular: improper functioning of the speech mechanism.

1535–45; < Latin improprius. See im-2, proper

improperly, adverb
improperness, noun

1–3. inapplicable, unsuited, unfit. 2. indecorous. Improper, indecent, unbecoming, unseemly are applied to that which is unfitting or not in accordance with propriety. Improper has a wide range, being applied to whatever is not suitable or fitting, and often specifically to what does not conform to the standards of conventional morality: improper diet; improper behavior in church; improper language. Indecent a strong word, is applied to what is offensively contrary to standards of propriety and especially of modesty: indecent behavior, literature. Unbecoming is applied to what is especially unfitting in the person concerned: conduct unbecoming a minister. Unseemly is applied to whatever is unfitting or improper under the circumstances: unseemly mirth.

1, 3. fitting, suitable. 2. proper. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
improper (ɪmˈprɒpə)
1.  lacking propriety; not seemly or fitting
2.  unsuitable for a certain use or occasion; inappropriate: an improper use for a tool
3.  irregular or abnormal

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1531 (implied in improperly) "not true," from Fr. impropre (14c.), from L. improprius, from in "not" + proprius (see proper). Meaning "not suited, unfit" is from 1570; that of "not in accordance with good manners, modesty, decency" is from 1739.
Online Etymology Dictionary, © 2010 Douglas Harper
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