[Adjective] Severe( rules), making difficult demands (measures). Example: Stringent measures have been introduced to deal with vandalism.
Found on http://www.bbc.co.uk/skillswise/glossary/
Strin'gent (strĭn'j e nt) adjective [ Latin stringens , -entis , present participle of stringere to draw or bind tight. See Strain .] Binding strongly; making strict requirements; restrictive; rigid; severe; as, stringent rules. « They must be sub... Found on http://www.encyclo.co.uk/webster/S/211
rigorously binding or exacting; strict; severe: stringent laws. · compelling, constraining, or urgent: stringent necessity. · convincing or forcible: stringent arguments. · (of the money market) characterized by a shortage in money for loan or investment purposes; tight. Found on https://www.infoplease.com/dictionary/stringent