inflexible
[ɪnˈfleksɪbəl]
Definitions
1. adjective
Unable to be bent or changed; stiff and unyielding
“The inflexible material cracked under the pressure.”
2. noun
A person who is unwilling to change their opinion or way of thinking
“He was considered an inflexible person because he refused to listen to alternative views.”
3. adverb
In a stiff or unyielding manner
“The manager handled the situation inflexibly, refusing to compromise.”