Here's what rhymes with unrefutable.
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usable fusible beautiful usual movable crucible cuticle moveable luminal provable reusable dutiable doable juvenile immovable renewable reducible removable unusable assumable mutual unusual irreducible reproducible deducible delusional excusable inducible irremovable presumable producible improvable unmovable unmoveable disprovable inexcusable consumable nonrenewable construable manoeuvrable constitutional institutional attitudinal latitudinal longitudinal unconstitutional distributional