Here's what rhymes with undefeatable.
repeatable treatable unrepeatable uneatable unbeatable interpretable Words that almost rhyme with undefeatable
readable reachable teachable teetotal impeachable unimpeachable unreadable unteachable feasible seasonal peaceable receivable indefeasible perceivable freezable unbelievable achievable believable redeemable unfeasible useable cleanable resealable squeezable unuseable regional agreeable appreciable conceivable disagreeable foreseeable unspeakable irredeemable unforeseeable inappreciable paracetamol retrievable nonseasonal teacupful concealable unreasonable inconceivable irretrievable interregional nonredeemable