Underperformed rhymes with:
outperformed, outperformed, outperformed, uniformed, brainstormed, outperformed, uniformed, alarmed, armed, brainstormed, charmed, conformed, deformed, disarmed, farmed, formed, harmed, informed, malformed, misinformed, outperformed, performed, reformed, stormed, swarmed, transformed, unarmed, unformed, unharmed, uniformed, uninformed, warmed