Atypical (adjective)

1. Not conforming to a type, pattern, or norm.
2. Not typical or normal; unusual.

Origin:

Early 19th century: from greek atypos "not of a particular type" + -ical.

Examples:

1. The patient's symptoms were atypical of the disease.
2. His behavior was atypical of a teenager.
3. The weather was atypical for this time of year.
4. The company's business model is atypical.
5. The outcome of the game was atypical of the team's performance.