Here's what rhymes with indefmitum.
erratum Words that almost rhyme with indefmitum
mutton button piton nubbin sudden exciton escutcheon glutton dudgeon unbutton scutcheon dubbin globin bludgeon bellybutton androgen custom cementum caecum accustom buxom buncombe bunkum dumdum secundum humdrum jejunum corundum conundrum colostrum carborundum