illegitimately in WordNet English dictionary

1. of biological parents not married to each other
   "this child was born illegitimately"
   illegitimately  out of wedlock  illegitimately  out of wedlock 
   
2. in a manner disapproved or not allowed by custom
   "He acted illegitimately when he increased the rent fourfold"
   illegitimately  illicitly  illegitimately  illicitly