atypical

The condition also has an associated atypical development of the retina and optic nerve misrouting, resulting in significant vision issues.

Hutchinson's freckle is a lentigo composed of atypical melanocytes.

Tom is taking an atypical antipsychotic.

It's not atypical.

SARS patients develop what is called atypical pneumonia, which is caused by a virus, not a bacterial infection, which meant that antibiotics did not help them.