S: (adj) uncompromising, sturdy, inflexible (not making concessions) "took an uncompromising stance in the peace talks"; "uncompromising honesty"
S: (adj) inflexible (resistant to being bent) "an inflexible iron bar"; "an inflexible knife blade"
S: (adj) inflexible, rigid, unbending (incapable of adapting or changing to meet circumstances) "a rigid disciplinarian"; "an inflexible law"; "an unbending will to dominate"