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