[adjective] having complicated nutritional requirements; especially growing only in special artificial cultures; "fastidious microorganisms"; "certain highly specialized xerophytes are extremely exacting in their requirements" Synonyms:fastidious
[adjective] severe and unremitting in making demands; "an exacting instructor"; "a stern disciplinarian"; "strict standards" Synonyms:stern, strict
[adjective] requiring precise accuracy; "an exacting job"; "became more exigent over his pronunciation" Synonyms:exigent