ETYM Latin fastidiosus disdainful, from fastidium loathing, aversion, perh. from fastus arrogance (of uncertain origin) + taedium loathing. Related to Tedious, Fash.
1. Giving and careful attention to detail; hard to please; excessively concerned with cleanliness.
2. (Microbiology) Having complicated nutritional requirements; especially growing only in special artificial cultures; SYN. exacting.
Very hard to please; particular about details; fussy and squeamish.