illicitly

Adverbial illicitly has 2 senses

• illicitly(r = adv.all) illegitimately - in a manner disapproved or not allowed by custom; "He acted illegitimately when he increased the rent fourfold"
Antonym: licitly

• illicitly(r = adv.all) illegally, lawlessly - in an illegal manner; "they dumped the waste illegally"