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

See also: illicit

Antonym: licitly

• nickelodeon
• nicker
• nicker nut
• nicker seed
• Nicklaus
• nicknack
• nickname
• Nicol prism
• Nicola Amati
• Nicola Sacco
• Nicolas de Malebranche
• Nicolas Leonard Sadi Carnot
• Nicolas Poussin
• Nicolaus Copernicus
• Nicolo Amati
• Nicolson
• Nicosia
• Nicotiana
• Nicotiana alata
• Nicotiana glauca
• Nicotiana rustica
• Nicotiana tabacum
• nicotinamide adenine dinucleotide
• nicotinamide adenine dinucleotide phosphate
• nicotine