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