Adjective

1. Of or pertaining to a deviation; characterized by deviation from an expectation or a social standard.

   At the trial, the extent of his deviant behavior became clear.

Noun

1. A person who deviates, especially from norms of social behavior.

   He was branded as a deviant and ostracized.

2. A thing, phenomenon, or trend that deviates from an expectation or pattern.

   As the graph shows, the March sales trend is the deviant.