improper

adjective

inappropriate, not suitable

Wiktionary

Pronunciation: /ɪmˈpɹɒp.ə/ / /ɪmˈpɹɔp.ə/ / /ɪmˈpɹɑ.pɚ/

adj

Etymology: From Middle French impropre, from Latin improprius (“not proper”), from in- + proprius (“proper”). By surface analysis, im- + proper.

Unsuitable to needs or circumstances; inappropriate; inapt.
Not in keeping with conventional mores or good manners; indecent or immodest.
“improper conduct”
Not according to facts; inaccurate or erroneous.
Not consistent with established facts; incorrect.
Not properly named; See, for example, improper fraction.
Not specific or appropriate to individuals; general; common.
“Not to be adorned with any art but such improper ones as nature is said to bestow, as singing and poetry.”
Of a complex random variable, correlated with its conjugate.

verb

Etymology: From Middle English empropren, perhaps from an unattested Anglo-Norman variant enproprier of Anglo-Norman apropr(i)er, approprier, related to modern French approprier.

To appropriate; to assign (something, to someone) as a possession or prerogative.
“He would in like manner improper and inclose the sunbeams to comfort the rich and not the poor.”
“For quotations using this term, see Citations:improper.”