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