Unrehearsed rhymes with:
rehearsed, rehearsed, hearst, herst, hirst, huerst, hurst, rehearsed, berst, burst, coerced, conversed, cursed, disbursed, dispersed, durst, emersed, first, furst, gerst, guaranty-first, headfirst, hearst, herst, hirst, huerst, hurst, immersed, interfirst, interspersed, kerst, kirst, medfirst, merced, nursed, pursed, rehearsed, reimbursed, reversed, submersed, thirst, unreimbursed, versed, werst, worst, wurst
Unrehearsed sounds like:
unhorsed, unmarked, unrequited, unrest