Unfeasible rhymes with:
infeasible, feasible, infeasible, feasible, infeasible, advisable, analyzable, disposable, divisible, excusable, exercisable, feasible, fusible, implausible, inadvisable, inexcusable, infeasible, invisible, plausible, realizable, recognizable, reusable, sizable, sizeable, unrecognizable, unusable, usable, visible