Improper
WordNet
adjective
(1) Not appropriate for a purpose or occasion
"Unsuitable attire for the office"
"Said all the wrong things"
(2) Not suitable or right or appropriate
"Slightly improper to dine alone with a married man"
"Improper medication"
(3) Not conforming to legality, moral law, or social convention
"An unconventional marriage"
"Improper banking practices"
WiktionaryText
Etymology
improprius “not proper,” from in- “in-” + proprius “proper.”
Adjective
- unsuitable to needs or circumstances; inappropriate
- Not in keeping with conventional mores or good manners; indecent or immodest
- Not according to facts; inaccurate or erroneous
- Not consistent with established facts; incorrect
- Not properly named; See, for example, improper fraction
Verb
to improper
- To appropriate
- To behave improperly