say it: im-PRAH-pur
improper is an adjective meaning "not suitable or right or appropriate". It carries 3 recorded senses.
not suitable or right or appropriate
“slightly improper to dine alone with a married man”
“improper medication”
“improper attire for the golf course”
not conforming to legality, moral law, or social convention
“an unconventional marriage”
“improper banking practices”
not appropriate for a purpose or occasion
“said all the wrong things”
Definitions, synonyms and semantic relations for improper come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.