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