adamant Synonyms

adamantine intransigent diamond inexorable stubborn stony stiff-necked stiff stern steely steadfast single-minded set tenacious tough unbendable unswerving pigheaded unwavering unyielding unshakable unrelenting unmoved uncompromising unbending rigid resolved resolute fixed implacable immovable headstrong hard flinty firm dogged determined inflexible insistent relentless pertinacious persistent opinionated obstinate obdurate mulish iron intractable decided