Here's what rhymes with unopposable.
disposable Words that almost rhyme with unopposable
negotiable sociable unsociable nonnegotiable renegotiable potable notable knowable approachable unapproachable inapproachable unknowable quotable erodible uncontrollable controllable irreproachable notional reproachable revokable consolable emotional devotional inconsolable unemotional promotional overemotional