strict in WordNet English dictionary

1. severe and unremitting in making demands
   "an exacting instructor"; "a stern disciplinarian"; "strict standards"
   stern  strict  exacting 
   
2. (of rules) stringently enforced
   "hard-and-fast rules"
   hard-and-fast  strict 
   
3. characterized by strictness, severity, or restraint
   nonindulgent  strict 
   
4. incapable of compromise or flexibility
   rigid  strict 
   
5. rigidly accurate; allowing no deviation from a standard
   "rigorous application of the law"; "a strict vegetarian"
   rigorous  strict