exacting

(verb) claim as due or just. Synonyms: demand, exact. Example: "The bank demanded payment of the loan."

(verb) take as an undesirable consequence of some event or state of affairs. Synonyms: claim, take, exact. Examples: "The accident claimed three lives." "The hard work took its toll on her."

(adj) having complicated nutritional requirements; especially growing only in special artificial cultures. Synonyms: fastidious (vs. unfastidious). Examples: "Fastidious microorganisms." "Certain highly specialized xerophytes are extremely exacting in their requirements."

(adj) severe and unremitting in making demands. Synonyms: stern, strict. Examples: "An exacting instructor." "A stern disciplinarian." "Strict standards."

(adj) requiring precise accuracy. Synonyms: exigent. Examples: "An exacting job." "Became more exigent over his pronunciation."