(ˈ)im, əm+ adjective
Etymology: Middle French impropre, from Latin improprius, from in- in- (II) + proprius own, proper — more at proper
: not proper: as
a. : not accordant with fact, truth, or right procedure : incorrect , inaccurate
arrived at an improper conclusion from the premises
charges of bribery, falsification of records, acceptance of improper fees — Current Biography
b. : not regularly or normally formed or not properly so called
improper fractions
c. : not suited to the circumstances, design, or end
an improper medicine
d. : not in accord with propriety, modesty, good taste, or good manners : indecorous
most improper to intrude a dog into the houses of the people they were calling on — Joseph Conrad
highly improper to dress ship at any time with college banners — C.D.Lane
: indecent
guilty of using improper language
wearing a scandalously improper dress
• im·properly “+ adverb
• im·properness “+ noun