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