1.Definition: emptying easily or excessively

Related Adjective(s):loose

2.Definition: lacking in firmness or tension; not taut

"A lax rope"

3.Definition: lacking in rigor or strictness

"Such lax and slipshod ways are no longer acceptable", "Lax in attending classes"

Related Adjective(s):slack

4.Definition: pronounced with muscles of the tongue and jaw relatively relaxed (e.g., the vowel sound in `bet')