lightness

1 the state or quality of having little weight the first thing I noticed about the little bird was its lightness; I could hardly tell I was holding it in my hand Synonyms slightness, weightlessness Related Words airiness, delicacy, ethereality, etherealness; flimsiness, fluffiness, insubstantiality Near Antonyms solidity, solidness, substantiality Antonyms heaviness, heftiness, massiveness, ponderousness, weightiness

2 a lack of seriousness often at an improper time the inappropriate lightness of the anchorman's tone while he was reading the story of the freak accident in which people had died Synonyms facetiousness, flightiness, flippancy, frivolousness, frothiness, levity, light-headedness, light-mindedness, lightness, sillinessRelated Words cheer, cheerfulness, festivity, gaiety (also gayety), glee, gleefulness, high-spiritedness, hilarity, joviality, lightheartedness, merriment, mirth, mirthfulness; childishness, goofiness, puerilityNear Antonyms dejection, depression, despondency, dispiritedness, downheartedness, gloom, gloominess, heartsickness, joylessness, melancholy, mopes, moroseness, sadness, sullenness, unhappinessAntonyms earnestness, gravity, seriousness, soberness, solemnity, solemnness