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