Estricto (en. Strict)
/esˈtrik.to/
Slang Meanings
Demanding in the enforcement of rules or norms.
That teacher is a strict one, she doesn't let even a minor infraction pass.
Esa profesora es una estricta, no deja pasar ni una falta.
As a way to describe someone who acts with rigidity.
The boss is very strict, he is always on top of everything.
El jefe es muy estricto, siempre está pendiente de todo.