Stringent (adjective)

1. Severe and strict in discipline or control.
2. Rigorous and demanding in nature.

Origin:

Late middle english (in the sense "binding, restrictive"): from latin stringent- "tightening, constricting", from the verb stringere.

Examples:

1. The new regulations are quite stringent.
2. Stringent measures have been taken to control the spread of the disease.
3. The stringent rules of the school made it difficult for the students.
4. The company has stringent quality control measures in place.
5. She had to pass a stringent test to become a pilot.