deviating from or inconsistent with the common order, form, or rule; irregular; abnormal

Advanced forms of life may be anomalous in the universe.

not fitting into a common or familiar type, classification, or pattern; unusual

He held an anomalous position in the art world.

incongruous or inconsistent.

Grammar . irregular.

adjective

conforming , normal , regular , standard , usual

adjective

aberrant , abnormal , atypical , bizarre , divergent , eccentric , exceptional , foreign , heteroclite , incongruous , inconsistent , irregular , odd , peculiar , preternatural , prodigious , rare , strange , unnatural , unorthodox , unrepresentative , untypical , unusual , anomalistic , atypic , deviant