stringent

not allowing for any exceptions or loosening of standards stringent rules against unauthorized persons being in the building Synonyms brassbound, cast-iron, exacting, hard-line, inflexible, rigorous, strict, rigid, uncompromisingRelated Words close, conscientious, exact, fussy, meticulous, painstaking, punctilious, scrupulous, undeviating; adamant, adamantine, determined, dogged, firm, relentless, resolved, single-minded, steadfast, stubborn, tenacious, unbending, unflinching; immovable, implacable, unappeasable, unrelenting, unsparing, unyielding; austere, demanding, flinty, grim, hard, hardened, hard-hearted, harsh, ironbound, severe, stern, toughNear Antonyms acquiescent, compliant, compromising, pliable, pliant, relenting, yielding; easy, easygoing, gentle, indulgent, kindly, lenient, merciful, mild, pampering, soft, spoiling, tolerant; neglectful, negligent, remiss, slipshod, sloppy, slovenly, unfussyAntonyms flexible, lax, loose, relaxed, slack