stringent

Definitions:

Stringency.
- The Clarendon dictionary. By William Hand Browne, Samuel Stehman Haldeman. Published 1894. (noun) (n.) (noun)
Making strict requirements; severe; rigid; as, stringent rules; tight; having little ready money; as, the money market is stringent.
- The Winston Simplified Dictionary. By William Dodge Lewis, Edgar Arthur Singer. Published 1919. (adjective) (adj.) (adjective)
Strict; severe.
- The Clarendon dictionary. By William Hand Browne, Samuel Stehman Haldeman. Published 1894. (adjective) (adj.) (adjective)
Binding strongly; severe; rigid; urgent.
- Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874. (adjective) (adj.) (adjective)
Binding strongly: urgent.
- The american dictionary of the english language. By Daniel Lyons. Published 1899. (adjective) (adj.) (adjective)
Stringentness.
- The Winston Simplified Dictionary. By William Dodge Lewis, Edgar Arthur Singer. Published 1919. (noun) (n.) (noun)
Stringently.
- The Winston Simplified Dictionary. By William Dodge Lewis, Edgar Arthur Singer. Published 1919. (adverb) (adv.) (adverb)
Binding strongly; urgent; exacting.
- The Clarendon dictionary. By William Hand Browne, Samuel Stehman Haldeman. Published 1894. (adjective) (adj.) (adjective)

Usage examples:

I gave no grounds for more stringent measures towards me.
- The Bramleighs Of Bishop's Folly by Charles James Lever
The demand is growing, even in these stringent times.
- Plain Facts by G. A. Bauman
To be on the safe side a prospective mother who has previously had a miscarriage should not travel at any time during pregnancy; others are not obliged to follow this stringent rule except during the first sixteen and the last four weeks of pregnancy.
- The Prospective Mother A Handbook for Women During Pregnancy by J. Morris Slemons