exacting

adjectives

having complicated nutritional requirements; especially growing only in special artificial cultures

"fastidious microorganisms"; "certain highly specialized xerophytes are extremely exacting in their requirements"

exacting, fastidious

severe and unremitting in making demands

"an exacting instructor"; "a stern disciplinarian"; "strict standards"

exacting, stern, strict

requiring precise accuracy

"an exacting job"; "became more exigent over his pronunciation"

exacting, exigent