strict
1 austere, authoritarian, firm, harsh, no-nonsense, rigid, rigorous, severe, stern, stringent
2 accurate, close, exact, faithful, meticulous, particular, precise, religious, scrupulous, true
3 absolute, complete, perfect, total, utter
Antonyms
1 easy-going, easy-oasy (slang) flexible, laid-back (informal) lax, mild, moderate, soft, tolerant
English Collins Dictionary - English synonyms & Thesaurus  

strict ( stricter comparative) ( strictest superlative )
1 adj A strict rule or order is very clear and precise or severe and must always be obeyed completely.
The officials had issued strict instructions that we were not to get out of the jeep..., French privacy laws are very strict..., All your replies will be treated in the strictest confidence...
♦
strictly adv ADV with v
The acceptance of new members is strictly controlled.
2 adj If a parent or other person in authority is strict, they regard many actions as unacceptable and do not allow them.
My parents were very strict., ...a few schools selected for their high standards and their strict discipline.
♦
strictly adv
My own mother was brought up very strictly and correctly.
3 adj If you talk about the strict meaning of something, you mean the precise meaning of it.
ADJ n
It's not quite peace in the strictest sense of the word, rather the absence of war.
♦
strictly adv ADV adj
Actually, that is not strictly true..., Strictly speaking, it is not one house at all, but three houses joined together.
→
strict
4 adj You use strict to describe someone who never does things that are against their beliefs.
ADJ n
Four million Britons are now strict vegetarians...
Translation English - Cobuild Collins Dictionary

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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"