
rigoros
strict
Very strict, uncompromising, and harsh in enforcing rules, measures, or principles.
Die Polizei kündigte an, rigoros gegen Falschparker vorzugehen.
The police announced that they would take strict action against illegal parkers.
rigorous
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strict
Very strict, uncompromising, and harsh in enforcing rules, measures, or principles.
Die Polizei kündigte an, rigoros gegen Falschparker vorzugehen.
The police announced that they would take strict action against illegal parkers.

rigorous
Especially thorough, exact, and meeting the highest standards. Often used in scientific or methodological contexts.
Die Studie wurde nach rigorosen wissenschaftlichen Kriterien durchgeführt.
The study was conducted according to rigorous scientific criteria.
The word 'rigoros' (rigorous/strict) can stand not only as an adjective before a noun, but also as an adverb describing a verb. In this case, it is not declined and describes the manner of an action.
Die neue Regelung wird rigoros umgesetzt.
The new regulation is being implemented strictly.
'rigoros' (rigorous/strict) is not a word for everyday usage, but belongs to a more formal or educated style. You often find it in newspaper articles, scientific texts, or official communications.
Die Regierung kündigte rigorose Sparmaßnahmen an.
The government announced rigorous austerity measures.
The context makes the meaning clear. If it is about rules, laws, or taking action against people, 'rigoros' usually means 'strict'. If it is about science, methods, or testing, it means 'thorough' or 'exact'.
Die Einhaltung der Sicherheitsvorschriften wird rigoros kontrolliert.
Compliance with the safety regulations is strictly monitored.
In the meaning of 'strict', 'rigoros' is often connected with verbs and nouns related to acting and controlling. Typical phrases are 'rigoros vorgehen' (to take strict action), 'rigoros durchgreifen' (to crack down hard), 'rigorose Maßnahmen' (strict measures), or 'rigorose Kontrollen' (strict controls).
Die Firma geht rigoros gegen jede Form von Diskriminierung vor.
The company takes strict action against every form of discrimination.
strict
Streng and rigoros describe the consistent enforcement of rules or measures. Streng is the more general and usually more neutral term, while rigoros emphasizes an especially uncompromising and harsh approach. Choose rigoros when no leniency is shown at all.

Die Stadt setzt die Parkregeln rigoros durch und akzeptiert keine Ausnahmen.
The city enforces the parking rules rigorously and accepts no exceptions.
Die Stadt hat strenge Regeln für das Parken im Zentrum.
The city has strict parking rules for the downtown area.