1 criminal /ˈkrɪmənl̟/ adjective
1 criminal
Learner's definition of CRIMINAL
: involving illegal activity : relating to crime
always used before a noun : relating to laws that describe crimes rather than to laws about a person's rights
compare civil 5; see also criminal law
not used before a noun, [more criminal; most criminal] : morally wrong
often used in a joking way to say that someone should not do something

— criminality

/ˌkrɪməˈnæləti/ noun [noncount]

— criminally

2 criminal /ˈkrɪmənl̟/ noun
plural criminals
2 criminal
plural criminals
Learner's definition of CRIMINAL
: a person who has committed a crime or who has been proved to be guilty of a crime by a court