implacable
I
adjective
adamant, immovable, implacabilis, inexorabilis, inexorable, inexpiable, inflexible, intransigent, irreconcilable, obdurate, obstinate, pitiless, relentless, unappeasable, unbending, uncompromising, unforgiving, unpacifiable, unpropitiating, unrelenting, unyielding, vindictive
II
index
callous, cruel, immutable, inexorable, irreconcilable, malevolent, pertinacious, relentless, remorseless, resentful, ruthless, severe, unaffected (uninfluenced), unbending, uncompromising, unrelenting, vindictive
Burton's Legal Thesaurus.
William C. Burton.
2006