illegitimate

Adjective

• of marriages and offspring; not recognized as lawful

• contrary to or forbidden by law
  • an illegitimate seizure of power
    
  • illicit trade
    
  • an outlaw strike
    
  • unlawful measures
    

Noun

• the illegitimate offspring of unmarried parents

Related words

• Synonyms: 
  illicit , outlaw(a) , outlawed , unlawful , bastard , by-blow , love child , illegitimate child , whoreson