lax
adj.
pronounced with muscles of the tongue and jaw relatively relaxed (e.g., the vowel sound in `bet')
adj.
lacking in firmness or tension; not taut
a lax rope
adj.
lacking in rigor or strictness
such lax and slipshod ways are no longer acceptable|lax in attending classes|slack in maintaining discipline
Synonym: slack
adj.
emptying easily or excessively
loose bowels
Synonym: loose
Antonym: tense