"inflexible" in the adjective sense
1. inflexible
incapable of change
"a man of inflexible purpose"
2. uncompromising, sturdy, inflexible
not making concessions
"took an uncompromising stance in the peace talks"
"uncompromising honesty"
3. inflexible
resistant to being bent
"an inflexible iron bar"
"an inflexible knife blade"
4. inflexible, rigid, unbending
incapable of adapting or changing to meet circumstances
"a rigid disciplinarian"
"an inflexible law"
"an unbending will to dominate"
Source: WordNet® (An amazing lexical database of English)
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