Open English Wordnet
Adjectives
(a)fastidiousgiving careful attention to detail; hard to please; excessively concerned with cleanliness“a fastidious and incisive intellect”, “fastidious about personal cleanliness”
(a)fastidious, exactinghaving complicated nutritional requirements; especially growing only in special artificial cultures“fastidious microorganisms”, “certain highly specialized xerophytes are extremely exacting in their requirements”