iron-fisted Synonyms

having a killer instinct unrelenting unmerciful uncompromising unbending tyrannical tough tight strict unsparing unyielding inhumane by the numbers unpermissive unforgiving unwavering heavy-handed authoritarian unappeasable stern severe ruthless implacable heartless harsh hard draconian cruel barbarous autocratic inexorable inflexible rigid remorseless relentless pitiless oppressive merciless ironclad intransigent acrimonious