Here's what rhymes with unbrightened.
brightened lightened frightened heightened tightened enlightened unenlightened Words that almost rhyme with unbrightened
ripened widened trident unripened stipend strident lighted likened livened cited delighted diamond sighted titled highland rifled rivaled rivalled siphoned trifled untitled wizened kited entitled united lipid recited indicted dialed enlivened unbridled unrivalled bridled cycled unrivaled bedizened dialled libelled libeled relighted naiad spited heisted invited excited guided minded hybrid sided stifled recycled vomited farsighted lifeblood sidled stylised spiraled tided spiralled unexcited longsighted redialed sniveled redialled provided divided reminded unprovided disunited unguided jeremiad motorcycled confided broadminded coincided absentminded simpleminded