stringent

stringent
strin‧gent /ˈstrɪndʒənt/ adjective1. a stringent law, rule, standard etc is very strict and must be obeyed:
    stringent anti-noise regulations
2. stringent economic conditions exist when there is a severe lack of money and strict controls on the supply of money
—stringently adverb
—stringency noun [uncountable]
     

THESAURUS

■ rule/law/system
   ▪ strict a strict order or rule is one that must be obeyed: There are strict rules about keeping tax records. | He had strict instructions to return the key to me.
   ▪ tight tight controls or limits are very strict about what is allowed and what is not allowed: The report recommends tighter controls on the advertising of alcohol. | There are tight regulations governing waste disposal.
   ▪ tough tough laws or rules are very strict: They want tougher laws against drinking and driving. | The federal government is introducing tough new rules on immigration.
   ▪ harsh harsh punishments or laws are very severe, often too severe: There are harsh penalties for drug trafficking. | The government has brought in harsh measures to combat the rioting taking place in many cities.
   ▪ stringent controlling what people can do with rules that have very high standards: There are now stringent controls on pollution from all power stations. | stringent new food safety regulations