DictionaryimproperInappropriate or unacceptable
adjective

improper

im-PRAH-per/ɪmˈprɑːpər/

Not appropriate or acceptable under the circumstances.

Resting muddy boots on the dining table is improper behavior for a guest.

A guest in muddy hiking boots putting feet onto an elegant dining table while others react with surprise, white adult, clear unsuitable conduct.
Etymology

The ancestor of proper meant “one's own” or “particular,” while proper developed the sense “fitting or appropriate.” The negative prefix makes improper its opposite: not fitting a purpose or meeting accepted standards.

In context

Braces Explained8:26
it can lead to an improper bite and it can also lead to your lower incisors down these teeth biting against the palate of your upper teeth and causing inflammation
Braces Overbite, Overjet, Underbite, Crossbite & Open Bite Explained!

More examples

  • It is improper to discuss a patient's records in public.
  • The audit reveals improper use of company funds.
  • Such jokes are improper at a memorial service.

Forms

improper

improperly adverb — In an inappropriate or unacceptable way.

impropriety noun — Behavior that violates accepted standards of conduct.

Similar words

inappropriate
Often stresses a poor fit for a particular situation.
unacceptable
Stresses failure to meet a required standard or limit.