having complicated nutritional requirements; especially growing only in special artificial cultures; fastidious microorganisms; certain highly specialized xerophytes are extremely exacting in their requirements

[ Syn: fastidious ]

severe and unremitting in making demands; an exacting instructor; a stern disciplinarian; strict standards

[ Syn: stern , strict ]

requiring precise accuracy; an exacting job; became more exigent over his pronunciation

[ Syn: exigent ]