stringent : (of rules) binding; rigid; marked by scarcity of money; Ex. stringent economic conditions
Synonyms: acrimonious, binding, brick-wall, by the book, by the numbers, compelling, confining, convincing, dead set on, demanding, draconian, drawing, dyed-in-the-wool, exacting, forceful, hard, hard-nosed, harsh, inflexible, iron-fisted, ironclad, picky, poignant, powerful, rigorous, rough, set, severe, stiff, strict, tough, unpermissive, valid
Notes: stringent often means simply ‘ strict , strictly regulated’ and also ‘tight or constricted’ and emphasizes the narrowness of what is permitted, while strict emphasizes the sternness with which something is enforced