This is the 10896th most frequent Catalan word.
rígida
Rigid.
In this sentence, 'rígida' describes a person (the teacher) who is firm and inflexible in their approach to enforcing rules.
La professora és molt rígida amb les normes de classe.
The teacher is very strict with the classroom rules.
Here, 'rígida' refers to an object's physical state of being hard and inflexible.
La cadira era tan rígida que no em podia asseure còmodament.
The chair was so rigid that I couldn't sit comfortably.
In this context, 'rígida' conveys the idea of a routine that is strictly structured and followed without deviations.