improper

adj

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.

   “Not to be adorned with any art but such improper ones as nature is said to bestow, as singing and poetry.”

7. 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.

   “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.”