Inert rhymes with:
alert, assert, avert, bert, berte, birt, blurt, boisvert, burt, burtt, chert, curt, dessert, dilbert, dirt, disconcert, divert, erte, evert, exert, flirt, gert, girt, herdt, hert, hirt, hurt, hurtt, insert, invert, kirt, kuhrt, kurt, mcgirt, mcguirt, mcwhirt, overt, peart, pert, purt, reassert, revert, schwerdt, shirt, skirt, spurt, squirt, subvert, thibert, unhurt, vanwert, vert, wert, wirt
Inert sounds like:
inertia, inherit, inherited, innard, inroad, inured, inward, ionarde