Synonyms of unyielding

Adjective

1. dogged, dour, persistent, pertinacious, tenacious, unyielding, stubborn (vs. docile), obstinate, unregenerate

usage: 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"

2. unyielding, hard (vs. soft)

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