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English definition of “criminal”

criminal

noun [C] uk   /ˈkrɪm.ɪ.nəl/ us  
B1 someone who commits a crime: a dangerous/violent criminal

criminal

adjective [before noun] uk   /ˈkrɪm.ɪ.nəl/ us  
B2 relating to crime: criminal activity a criminal act/offence criminal behaviour a criminal investigation very bad or morally wrong: It's criminal to charge so much for a book. The way we waste this planet's resources is criminal.
criminality
noun [U] uk   /ˌkrɪm.ɪˈnæl.ɪ.ti/ us    /-ə.t̬i/
criminally
adverb uk   /-i/ us  
(Definition of criminal from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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