2. Not strict or stringent; not exact; loose; weak; vague; equivocal. The discipline was lax. (Macaulay) Society at that epoch was lenient, if not lax, in matters of the passions. (j. A. Symonds) The word aeternus itself is sometimes of a lax signification. (Jortin)
3. Having a looseness of the bowels; diarrheal.
Synonym: loose, slack, vague, unconfined, unrestrained, dissolute, licentious.