exacting vs fastidious

exacting and fastidious both are adjectives.

Word	Noun	Adjective	Verb	Adverb
exacting	No	Yes	No	No
fastidious	No	Yes	No	No

As adjectives, exacting and fastidious are synonyms defined as:

exacting and fastidious: having complicated nutritional requirements; especially growing only in special artificial cultures

exacting (adjective)	fastidious (adjective)
having complicated nutritional requirements; especially growing only in special artificial cultures	giving careful attention to detail; hard to please; excessively concerned with cleanliness
requiring precise accuracy	having complicated nutritional requirements; especially growing only in special artificial cultures
severe and unremitting in making demands