nonentity noun2 •An unimportant or insignificant person or thing.The Queen Mother detests, but she dreads me—my uncle is indifferent, but finds me of use—our new Queen is already a nonentity—and Louis knows that my house is the most agreeable in Paris. — 1834 •The state of not existing; nonexistence.New objects, new amusements, will occupy her mind; and unhappiness, equally unsuspected and unspoken, will die of its own nonentity. — 1831 formsnonentities