Here's what rhymes with polysynthetical.
heretical theoretical poetical parenthetical hermetical antithetical exegetical alphabetical arithmetical Words that almost rhyme with polysynthetical
biomedical helical vesicle vesical spherical metrical testicle technical identical evangelical hysterical lexical symmetrical indelible unethical angelical electrical asymmetrical imperceptible nonsensical hemispherical obstetrical unsymmetrical dialectical geometrical academical nontechnical diametrical nonidentical extendible infinitesimal ecumenical trigonometrical nonelectrical petrochemical pyrotechnical electrochemical incomprehensible