unsuitable to needs or circumstances; inappropriate; inapt / Not in keeping with conventional mores or good manners; indecent or immodest / Not according to facts; inaccurate or erroneous

(obsolete, transitive) To appropriate; to limit. / (obsolete) To behave improperly

present participle of improper

simple past tense and past participle of improper

Third-person singular simple present indicative form of improper

Quality of being improper.

(arithmetic) A vulgar fraction of which the numerator has a greater magnitude than the denominator, such as 3/2.

plural of improper fraction

(mathematics) An integral where at least one of the endpoints is taken as a limit, either to a specific number or to infinity.

plural of improper integral