Here's what rhymes with deadlyest.
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left theft deft weft cleft refreshed bereft enmeshed get next set went yet cent felt kept let met sent meant text debt net belt bent checked dealt rent wet bet jet lent melt sect tent knelt leaped pet scent sensed vent wept wrecked fetched leapt reset vexed decked dent fenced necked orient pent preset vet against effect direct percent correct event perfect prevent spent affect helped protect threat descent detect reject slept stepped swept assent elect erect sweat ascent beset crept dissent dwelt lament repent sketched adept dreamt epithet flexed resent tempt beget duet fret inept pipette redirect smelt spelt wrenched except respect accept attempt represent forget reflect select collect commenced intellect intent regret stretched accent cement connect dialect offset upset invent augment bayonet cassette clenched dispensed drenched ferment intercept intersect parapet perplexed quenched cadet deflect infect inject shipwrecked transept unchecked subject extent expect consent president indirect neglect suspect architect cigarette exempt incorrect alphabet condensed entrenched inspect recollect retrospect underwent outstretched disrespect quartet silhouette contempt clarinet disconnect discontent circumvent circumspect