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