IPA: /ˈkrɪmɪnəli/
KK: /ˈkrɪmɪnəli/
In a way that relates to crime or is illegal.
He was criminally charged for his actions.
Criminally → It is formed from "criminal" (from Latin *criminalis*, meaning relating to crime) and the suffix "-ly" (meaning in a manner of). The word "criminally" means in a manner relating to crime or in a way that is criminal.
Think of the word 'criminal' which relates to crime, and remember that 'criminally' means acting in a way that is related to crime.