rigid
ri-gid
adjective
Unable to be bent or changed in shape; very stiff and unmoving.
"The metal frame remained rigid."
adjective
Unwilling to change one's ideas or behaviour; very strict and unbending.
"He held rigid views on education."
Thesaurus
Synonyms: stiff, inflexible, set, fixed, nonmoving, unmoving, unadaptable, unbending, semirigid, strict, intolerant
Antonyms: nonrigid