improper

1. Unsuitable to needs or circumstances; inappropriate; inapt.

   unpassend

   неуме́стныйneuméstnyj, неподходя́щийnepodxodjáščij, ненадлежа́щийnenadležáščij

   ненале́жнийnenaléžnyj, невідпові́днийnevidpovídnyj

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

   improper conduct

   unhöflich

   непристо́йныйnepristójnyj, неприли́чныйneprilíčnyj, некорре́ктныйnekorréktnyj

   непристо́йнийneprystójnyj, некоре́ктнийnekoréktnyj

3. Not according to facts; inaccurate or erroneous.

   непра́вильныйneprávilʹnyj, оши́бочныйošíbočnyj, ло́жныйlóžnyj

4. Not consistent with established facts; incorrect.

   непра́вильныйneprávilʹnyj

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

6. Of a complex random variable, correlated with its conjugate.

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

1. With improper use, he damaged the machine.

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2. Boldi was charged with improper child care.

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3. Some people consider sex before marriage improper behavior.

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4. It is improper to impose sanctions upon the union.

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5. In different circles, that could be proper or improper.

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regular