Here's what rhymes with undoffable.
double bubble rubble stubble publ tamable trouble friable dirigible playable vocable unplayable flyable beatable unloveable addable damnable uncharitable redouble unbridgeable nonviable attachable unnameable containable unlikable acquirable vincible dividable conformable imperishable filtrable compoundable imperturbable indissoluble unarguable ignitable exploitable translatable untranslatable indemonstrable transmutable Words that almost rhyme with undoffable
subtle shuttle suppl supple huddle fuddle couple muddle puddle scuttle tuple cuddle cudgel rappel befuddle decouple rebuttal uncouple oversubtle thermocouple humble funnel shovel shuffle hovel hustle subtile fumble suckle muscle tunnel puzzle bustle fungal muzzle tumble buckle chuckle jumble rumble rustle stumble tional knuckle muffle mussel ruffle scuffle smuggle juggle mumble phrasal tussle bumble caecal runnel snaffle snuggle guzzle nuzzle pummel duckbill gunnel snuffle tamale tousle gumball tubful struggle bundle frontal jungle autumnal crumble ductile bestowal ductal grumble pustule reshuffle truffle bungle truckle lungful nonvocal rumple jugful tumbrel mugful kerfuffle pinocle triumphal colourful crustal nuptial antifungal honeysuckle lustful peduncle crumple trundle unbuckle cupsful prefrontal conformal suboptimal carbuncle trustful prenuptial duodecimal disgruntle subcortical distrustful heptagonal mistrustful granduncle