iron-fisted

barbarous callous cruel fierce grim harsh implacable inexorable inhumane relentless ruthless severe unforgiving unrelenting unsparing unyielding

unmerciful

compassionless cutthroat dog-eat-dog gratuitous hard hardhearted hatchet job having a killer instinct mean machine mortal pitiless unappeasable uncalled-for unfeeling unflinching unpitying unsympathetic wanton

bright calm compassionate considerate easy feeling flexible gentle kind merciful mild nice peaceful polite remorseful sympathetic tender yielding

giving sparing

draconian exacting harsh rigid rigorous scrupulous severe stern stringent tough

austere dead set disciplinary dour firm forbidding grim hard hard-boiled no-nonsense oppressive picky prudish punctilious puritanical set square stickling straight strait-laced stuffy unpermissive unsparing uptight

easy easygoing facile flexible gentle kind lenient mild nice soft tolerant

amenable tractable uncertain yielding

binding demanding draconian exacting forceful harsh inflexible ironclad rigorous severe stiff strict tough

acrimonious brick-wall by the book by the numbers compelling confining convincing dead set on drawing dyed-in-the-wool hard hard-nosed picky poignant powerful rough set unpermissive valid

amenable calm easy easygoing facile flexible gentle kind lenient mild nice pliable pliant soft weak willing yielding

inexact tolerant

ceaseless constant continual continuous endless implacable incessant inexorable persistent relentless ruthless tenacious unabated unremitting unwavering unyielding

bound bound and determined brick-wall cruel dead set on grim hanging tough hardheaded intransigent mortal perpetual pitiless remorseless rigid set steady stern stiff stiff-necked tough unbending unbroken unflinching unsparing

broken ceasing changeable completed ending finished flexible halting inconstant infrequent intermittent interrupted irregular kind merciful nice occasional stopping surrendering sympathetic terminable varying wavering yielding

compassionate relenting