strict

Meanings

• rigidly accurate; allowing no deviation from a standard
  • "a strict vegetarian"
• (of rules) stringently enforced
• characterized by strictness, severity, or restraint
• incapable of compromise or flexibility
• severe and unremitting in making demands
  • "strict standards"

Synonyms

exacting, hard-and-fast, nonindulgent, rigid, rigorous, stern