Unexplained rhymes with:
explained, explained, explained, complained, explained, planed, complained, explained, planed, abstained, arraigned, ascertained, attained, brained, campaigned, caned, chained, complained, constrained, contained, craned, deigned, detained, disdained, drained, entertained, explained, feigned, gained, grained, ingrained, maintained, maned, obtained, ordained, pained, pertained, planed, preordained, rained, refrained, regained, reigned, reined, remained, restrained, retained, retrained, self-contained, sprained, stained, strained, sustained, trained, unconstrained, unrestrained, unstained, untrained, waned