thoughtlessness
131forgetfulness — Synonyms and related words: abandon, careless abandon, carelessness, casualness, cursoriness, disregardfulness, easiness, hastiness, heedlessness, inconsiderateness, inconsideration, indifference, insouciance, lack of foresight, laziness, lethe,… …
132frivolity — Synonyms and related words: amusement, asininity, battiness, big deal, brainlessness, buffoonery, clownishness, crackpottedness, crankiness, craziness, daffiness, dallying, desipience, eccentricity, emptiness, fatuity, fatuousness, flightiness,… …
