Here's what rhymes with nonhelpful.
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healthful unhealthful septal several careful temple vessel settle vengeful faecal feral festal fretful semble sessile venial fennel unsettle fettle shekel vestal heckle shovelful zestful headstall level central special essential mental successful metal devil gentle dental dreadful pencil rebel sterile ancestral assemble methyl peril rental tensile ventral kettle medal pedal rectal stressful acetyl bevel eventful meddle mesial pebble restful revel wrestle bestial betel exemple kennel mettle nettle pestle petal prayerful beryl lentil nestle nonessential peddle speckle cecal freckle mescal bezel nonmetal chestful celestial epithelial parental resemble spectral unsuccessful endothelial especial tremble oriental tangential forgetful inferential resentful treble uneventful erectile imperil revengeful trestle dissemble inessential resettle suspenseful treadle embezzle pretzel dishevel overcareful potential differential influential confidential elemental incidental monumental ornamental respectful sequential orchestral placental referential circumferential dimethyl deferential evidential judgmental neglectful occidental reverential sentential torrential distressful prehensile reassemble regretful traversal unessential utensil bedevil bipedal judgemental gunmetal fundamental governmental accidental continental residential incremental preferential sentimental projectile regimental consequential prudential palpebral penitential pubertal tocopherol credential dialectal nonjudgmental nonresidential disassemble primaeval teakettle cockleshell environmental instrumental presidential detrimental existential exponential transcendental supplemental coincidental colorectal inconsequential nongovernmental providential temperamental multilevel quintessential unsentimental departmental experiential disrespectful compartmental excremental quadrupedal experimental developmental intergovernmental intercontinental subcontinental nondepartmental transcontinental interdepartmental