Meaning of “inflexible” - Learner’s Dictionary

inflexible

adjective uk us /ɪnˈfleksəbl/
NOT CHANGING

Inflexible rules, opinions, beliefs, etc do not change easily:

a cold and inflexible man
STIFF

Inflexible materials do not bend easily.

inflexibility uk us /ɪnˌfleksəˈbɪləti/ noun [ U ]

(Definition of “inflexible” from the Cambridge Learner’s Dictionary © Cambridge University Press)