IPA: //ˌoʊvərˈfaɪn//
KK: /oʊvərfaɪn/
Something that is excessively fine or very delicate, often to the point of being too much.
The artist used an overfine brush to create intricate details in the painting.
Overfine → It is formed from "over-" (meaning excessively) and "fine" (from Old French *fin*, meaning delicate or of high quality). The word "overfine" means excessively delicate or of too high a quality.
Think of something that is 'excessively' ('over-') 'delicate' or 'high quality' ('fine') — that's why overfine refers to something that is too delicate or refined.