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