exacting

Adjective

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

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

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

Related words

• Synonyms: 
  exigent , stern , strict , fastidious