1. In a manner disapproved or not allowed by custom
   - illegitimately 
2. In an illegal manner
   - illegally, lawlessly

See also: illicit

Antonym: licitly

• mouse-ear cress
• mouse-ear hawkweed
• mouse-eared
• mouse-eared bat
• mouse-sized
• mouse-tooth forceps
• mousehole tree
• mouselike
• mousepad
• mouser
• mousetrap
• mousey
• moussaka
• mousse
• mousseline de sole
• Moussorgsky
• moustache
• moustache cup
• moustachio
• mousy
• mouth
• mouth bow
• mouth harp
• mouth hole
• mouth off