Here's what rhymes with objectional.
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attentional obsessional terrible dimensional spectacle genital intentional parable retinal textual detectable seminal sentinel tenable bearable testable tentacle pentacle perceptional bendable detectible medical professional chemical conventional exceptional festival intestinal marital vegetable plentiful sensual confessional dependable pedestal sceptical unbearable untenable detestable impeccable legible trigeminal unintentional delectable digestible extensional twodimensional undetectable concessional processional correctable wearable breathable conceptional perfectible recessional spendable weldable electable acceptable accessible cerebral flexible sensible clerical congenital perceptual respectable amenable congressional credible perceptible skeletal skeptical segmental illegible ineffable ostensible polemical alchemical execrable unprofessional urogenital contestable inedible collectible repairable suggestible undependable unexceptional amendable collectable stretchable subprofessional suppressible connectable spreadable unwearable connectible quenchable numerical susceptible biochemical heterosexual homosexual commendable contemptible lamentable multidimensional receptacle unconventional defensible irrepressible premarital chimerical compressible expendable geochemical indigestible intertextual presentable preventable psychosexual threedimensional dispensable prophetical impressible extendable premedical preventible comestible hypothetical incredible inaccessible unacceptable inflexible insensible impregnable regrettable unforgettable expressible incontestable photochemical unquenchable extensible nonprofessional paramedical paraprofessional forgettable unpreventable noncollectable indispensable histochemical incompressible indefensible anticlerical insusceptible semiprofessional recommendable nonclerical nonnumerical gastrointestinal inexpressible reprehensible extramarital intracerebral alphanumerical comprehensible physicochemical musculoskeletal immunohistochemical