[adj] literal meanings; "an inflexible iron bar"; "an inflexible knife blade"
[adj] extended meanings; incapable of change; "a man of inflexible purpose"
[adj] not making concessions; "took an uncompromising stance in the peace talks"; "uncompromising honesty"
[adj] incapable of adapting or changing to meet circumstances; "a rigid disciplinarian"; "an inflexible law"; "an unbending will to dominate"
adamant, adamantine, brassbound, die-hard(a), flinty, fossilised, fossilized, granitic, hardcore, hard-core, hardline, hard-line, inexorable, intransigent, ironclad, muscle-bound, ossified, rigid, rock-ribbed, semirigid, stand-up, stiff, stiffened, unadap