Englishlax
adjective
lax discipline in schools:
slack, slipshod, negligent, neglectful, remiss, careless, heedless, unmindful, inattentive, slapdash, offhand, casual;
easy-going, lenient, permissive, soft, liberal, non-restrictive, indulgent, overindulgent, complaisant, over-tolerant, irresponsible;
informal sloppy.
▷antonyms stern, careful.
lax (1) Oxford Dictionary of English