"laxest" in the adjective sense
1. lax, slack
lacking in rigor or strictness
"such lax and slipshod ways are no longer acceptable"
"lax in attending classes"
"slack in maintaining discipline"
pronounced with muscles of the tongue and jaw relatively relaxed (e.g., the vowel sound in `bet')
lacking in firmness or tension not taut
"a lax rope"
4. lax, loose
emptying easily or excessively
Source: WordNet® (An amazing lexical database of English)
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