Unharmed rhymes with:
harmed, alarmed, armed, charmed, disarmed, farmed, harmed, unarmed, alarmed, armed, brainstormed, charmed, conformed, deformed, disarmed, farmed, formed, harmed, informed, malformed, misinformed, outperformed, performed, reformed, stormed, swarmed, transformed, unarmed, underperformed, unformed, uniformed, uninformed, warmed
Unharmed sounds like:
unarmed, unearned, unremitted, unwarranted