Infeasible rhymes with:
unfeasible, feasible, unfeasible, feasible, unfeasible, advisable, analyzable, disposable, divisible, excusable, exercisable, feasible, fusible, implausible, inadvisable, inexcusable, invisible, plausible, realizable, recognizable, reusable, sizable, sizeable, unfeasible, unrecognizable, unusable, usable, visible
Infeasible sounds like:
impassable, impassively, impeachable, impeccable, impeccably, impossible, impossibly, invisible