Here's what rhymes with subpropositional.
positional additional oppositional prepositional propositional traditional transitional volitional depositional dispositional conditional compositional definitional cognitional nutritional unconditional inquisitional nontraditional Words that almost rhyme with subpropositional
provisional divisional medicinal fictional original syllable frictional polygonal finagle political criminal typical visible visual digital miracle aboriginal occipital pitiful pinnacle thinkable binnacle spiracle tillable billable nonfictional steerable biddable fixable winnable sinkable individual clinical biblical mythical permissible juridical pivotal satirical unthinkable despicable divisible jurisdictional derivable miscible livable antipodal unoriginal pinochle thimbleful unsinkable kissable refillable shrinkable bridgeable mixable principle principal invisible reciprocal admissible episcopal hospitable invincible transcriptional biophysical geophysical pontifical subclinical quizzical diacritical drinkable printable resistible transmittable unlivable utilisable ignitible irresistible predictable equivocal explicable transmissible forgivable undrinkable unprintable extricable nonrefillable relivable municipal unpredictable unequivocal inadmissible psychophysical archiepiscopal unforgivable astrophysical nonclinical nonreciprocal inexplicable