definition of
unyielding

[1] #1 unyielding s. [dogged, dour, persistent, pertinacious, tenacious] 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". wn

[2] #2 unyielding s. resistant to physical force or pressure; "an unyielding head support". wn