Undeterred rhymes with:
deterred, deterred, deterred, interred, stirred, absurd, alward, bird, blurred, burd, byrd, chauffeured, concurred, conferred, curd, deferred, demurred, deterred, ferd, gerd, gird, gjerde, heard, herd, hird, hurd, incurred, inferred, interred, jerde, kurd, leard, misheard, nerd, occurred, overheard, prefered, preferred, recurred, referred, reword, slurred, spurred, stirred, third, transfered, transferred, uncured, unheard, word
Undeterred sounds like:
underrate, underrated, undertow, underwood, underwrite, underwrote, unhindered, unitrode, untoward, untreated, untried, untruth