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