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