fastidious vs exacting

fastidious and exacting both are adjectives.

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

As adjectives, fastidious and exacting are synonyms defined as:

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

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