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

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

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

Not according to facts; inaccurate or erroneous.

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

Unsuitable to needs or circumstances; inappropriate; inapt.

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

Not consistent with established facts; incorrect.