Spotty (adjective)

1. Having spots or marks on the surface, often irregular or randomly distributed.
2. Inconsistent, with good and bad periods or areas.
3. Having a rash of spots or pimples.

Origin:

From the word "spot" which means a small, round or irregular mark or area, it refers to something that has spots or marks.

Examples:

1. The leopard has a spotty coat.
2. The apple had a spotty surface.
3. His performance was spotty, sometimes he did very well and other times he did poorly.
4. She had a spotty record of attendance at work.
5. His skin was spotty, with acne on his face.