Atypical

adjective departing from the usual course; deviating from the norm; abnormal

• The scientist noticed an aberrant result in his experiment that did not align with the expected outcome.
• Her behavior at the party was quite aberrant compared to how she usually acts.
• I can't believe he did something so aberrant, it's totally out of character for him.
• The artist's painting featured an aberrant color scheme that made it stand out among the other pieces.

noun a person or thing that is abnormal

adjective deviating from what is normal or usual; not typical

• The results of the medical tests showed abnormal levels of certain enzymes.
• She thought it was abnormal for him to eat ice cream for breakfast every day.
• I heard that party was really abnormal, with people dancing on the tables and everything.
• His behavior at work was abnormal, like a fish out of water.