improper

Unsuitable to needs or circumstances; inappropriate; inapt.

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

improper conduct

Not according to facts; inaccurate or erroneous.

Not consistent with established facts; incorrect.

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

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

He would in like manner improper and inclose the sunbeams to comfort the rich and not the poor.

For quotations using this term, see Citations:improper.