"fastidious" in the adjective sense
giving careful attention to detail hard to please excessively concerned with cleanliness
"a fastidious and incisive intellect"
"fastidious about personal cleanliness"
2. fastidious, exacting
having complicated nutritional requirements especially growing only in special artificial cultures
"certain highly specialized xerophytes are extremely exacting in their requirements"
Source: WordNet® (An amazing lexical database of English)
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