Definition of "improper" in English

adjective

1. Unsuitable to needs or circumstances; inappropriate; inapt.

2. Not in keeping with conventional mores or good manners; indecent or immodest.

   • improper conduct

3. Not according to facts; inaccurate or erroneous.

4. Not consistent with established facts; incorrect.

5. Not properly named; See, for example, improper fraction.

6. (obsolete) Not specific or appropriate to individuals; general; common.

7. (mathematics) Of a complex random variable, correlated with its conjugate.

verb

1. (obsolete, transitive) To appropriate; to assign (something, to someone) as a possession or prerogative.

   • For quotations using this term, see Citations:improper.