Here's what rhymes with undiftinguifhable.
double bubble rubble stubble publ trouble friable playable vocable flyable vincible addable dirigible redouble nonviable acquirable beatable tamable unloveable conformable imperishable damnable attachable filtrable unnameable ignitable unlikable unplayable dividable imperturbable indissoluble uncharitable exploitable unbridgeable unarguable containable translatable indemonstrable compoundable untranslatable transmutable Words that almost rhyme with undiftinguifhable
subtle shuttle suppl supple huddle fuddle couple muddle puddle scuttle tuple cuddle cudgel rappel befuddle oversubtle rebuttal decouple uncouple 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 kerfuffle struggle bundle frontal jungle crumble ductile ductal grumble pustule reshuffle truffle bungle truckle lungful nonvocal rumple jugful tumbrel mugful autumnal colourful crustal nuptial bestowal honeysuckle lustful crumple trundle unbuckle cupsful pinocle triumphal antifungal conformal peduncle carbuncle trustful duodecimal disgruntle prefrontal suboptimal mistrustful prenuptial granduncle heptagonal subcortical distrustful