Definitions from Wiktionary ( )

▸ adjective:  Unsuitable to needs or circumstances; inappropriate; inapt.
▸ adjective:  Not in keeping with conventional mores or good manners; indecent or immodest.
▸ adjective:  Not according to facts; inaccurate or erroneous.
▸ adjective:  Not consistent with established facts; incorrect.
▸ adjective:  Not properly named; See, for example, improper fraction.
▸ adjective:  (obsolete) Not specific or appropriate to individuals; general; common.
▸ adjective:  (mathematics) Of a complex random variable, correlated with its conjugate.
▸ verb:  (obsolete, transitive) To appropriate; to limit.
▸ verb:  (obsolete) To behave improperly

---

▸ Word origin

▸ Words similar to improper
▸ Usage examples for improper

▸ Idioms related to improper
▸ Wikipedia articles (New!)
▸ Popular nouns described by improper
▸ Words that often appear near improper
▸ Rhymes of improper

▸ Invented words related to improper