stringent Synonyms

rigorous tight exacting harsh uncompromising tough draconian demanding stern strict inflexible rigid hard severe precise restrictive strait stiff restringing spartan poignant ruthless sharp relentless stringency stricter tougher strictest rigourous ironhanded hardline hard and fast unpermissive authoritarian unsparing thorough swingeing tighter strong radical punitive cruel critical convincing constrictive constrained confining coercive caustic careful