Here's what rhymes with irrational.
rational national international lnternational multinational transnational supranational Words that almost rhyme with irrational
radical fractional factional satiable capital diagonal fallible palatal sagittal cannibal flammable laughable cantonal blamable fanciable practical valuable casual tangible palpable taxable hexagonal implacable infallible mandible pyramidal clavicle inflammable interactional octagonal tractable detachable passable madrigal chasuble bankable cantabile graspable frangible savable declarable grammatical invaluable adaptable impassable impractical intangible intractable transactional impalpable collapsible impassible unflappable attractable compatible expandable merchantable unpractical retractable nonflammable incompatible ungrammatical semiannual nontaxable nondetachable extrapyramidal understandable