Pronunciation: (laks),[key] —adj.,-er, -est. 1. not strict or severe; careless or negligent: lax morals; a lax attitude toward discipline. 2. loose or slack; not tense, rigid, or firm: a lax rope; a lax handshake. 3. not rigidly exact or precise; vague: lax ideas. 4. open, loose, or not retentive, as diarrheal bowels.
5. (of a person) having the bowels unusually loose or open.
6. open or not compact; having a loosely cohering structure; porous: lax tissue; lax texture. 7. Phonet.(of a vowel) articulated with relatively relaxed tongue muscles. Cf. tense1 (def. 4).