improper

Short definition from Wiktionary

Adjective

1. 1
   Unsuitable to needs or circumstances; inappropriate; inapt.
2. 2
   Not in keeping with conventional mores or good manners; indecent or immodest.
3. 3
   Not according to facts; inaccurate or erroneous.
4. 4
   Not consistent with established facts; incorrect.
5. 5
   Not properly named; See, for example, improper fraction.
6. 6
   Not specific or appropriate to individuals; general; common.
7. 7
   Of a complex random variable, correlated with its conjugate.

Verb

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