Here's what rhymes with uncompromising.

Consider these alternatives

unwavering / wavering confrontational / educational forthright / right unapologetic / magnetic resolute / group imperious / serious outspoken / broken attitude / food pragmatic / dramatic determination / information idiosyncratic / democratic tenacious / basis defiant / client bellicose / close ferocious / diagnosis conciliatory / story unafraid / made denunciation / relation