improper
adjective
LAW uk/ɪmˈprɒpər/ usdishonest, and not allowed by a rule or by law:
The cropland may have been polluted because of improper use of pesticides and fertilizers.
improper accounting/payments/trading
improper activity/conduct/practices
improperly
adverb
The chief executive was cleared of acting improperly in selling the shares.