[adj] severe and unremitting in making demands; "an exacting instructor"; "a stern disciplinarian"; "strict standards"
[adj] rigidly accurate; allowing no deviation from a standard; "rigorous application of the law"; "a strict vegetarian"
[adj] unsparing and uncompromising in discipline or judgment; "a parent severe to the pitch of hostility"- H.G.Wells; "a hefty six-footer with a rather severe mien"; "a strict disciplinarian"; "a Spartan upbringing"
[adj] not indulgent; "strict parents"
[adj] (of rules) stringently enforced; "hard-and-fast rules"
[adj] incapable of compromise or flexibility
demanding, exact, exacting, hard-and-fast, intolerant, invariable, nonindulgent, rigid, rigorous, severe, spartan, stern, unpermissive