Least strict

• Overpermissive to the extreme
• Least stringent
• Most laid back
• Having the fewest rules
• Most permissive
• Least demanding
• Rodin's The Kiss is French - and most permissive

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Lax \Lax\ (l[a^]ks), a. [Compar. Laxer (l[a^]ks"[~e]r); superl. Laxest .] [L. laxus Cf. Laches , Languish , Lease , v. t., Leash .] Not tense, firm, or rigid; loose; slack; as, a lax bandage; lax fiber. The flesh of that sort of fish being lax and spongy. ...

Wiktionary Word definitions in Wiktionary
a. (en-superlativelax)