Not bending; inflexible.

stubbornly unyielding; "dogged persistence"; "dour determination"; "the most vocal and pertinacious of all the critics"; "a mind not gifted to discover truth but tenacious to hold it"- T.S.Eliot; "men tenacious of opinion"[syn: dogged ]

resistant to physical force or pressure; "an unyielding head support"

adjective

flexible , irresolute , surrendering , yielding

adjective

adamant , dead set on , determined , firm , fixed , hard , hard-core * , hardheaded , hard-line * , hard-nosed , headstrong * , immalleable , immovable , implacable , impliable , inexorable , inflexible , intractable , locked in , merciless , mulish , obdurate , obstinate , pertinacious , pigheaded * , refractory , relentless , rigid , ruthless , single-minded , solid , staunch , stiff , stiff-necked , stubborn , tough , unbending , uncompliant , uncompromising , unmovable , unrelenting , unswayable , unwavering , inelastic , constant , resolute , steadfast , steady , unflinching , demanding , exacting , harsh , stern , strict , adamantine , brassbound , die-hard , grim , incompliant , intransigent , iron , remorseless , unbendable , fast , game , headstrong , indomitable , insubmissive , ironclad , perseverant , persistent , pigheaded , recalcitrant , steely , stony , tenacious , truculent , unbudging , unimpressible , unshakable , unsubmissive , wooden