Main Entry:

im·prop·er

Pronunciation:

\(ˌ)im-ˈprä-pər\

Function:

adjective

Etymology:

Middle English, from Middle French impropre, from Latin improprius, from in- + proprius proper

Date:

15th century

: not proper: as a: not in accord with fact, truth, or right procedure : incorrect <improper inference> b: not regularly or normally formed or not properly so called c: not suited to the circumstances, design, or end <improper medicine> d: not in accord with propriety, modesty, good manners, or good taste <improper language>

synonyms see indecorous

— im·prop·er·ly adverb

— im·prop·er·ness noun