Synonyms and Antonyms of stringent
- stringent rules against unauthorized persons being in the building
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, tough