iron-fisted Synonyms

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