flightiness

1 a lack of seriousness often at an improper time a warning that her usual flightiness wouldn't be tolerated at the ceremony honoring war veterans Synonyms facetiousness, frivolity, 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

2 a state of nervousness marked by sudden jerky movements his flightiness before the bar exam was so bad that he nearly made himself sick Synonyms edginess, fidgetiness, fidgets, jumpiness, jitteriness, restiveness, skittishnessRelated Words agita, agitation, anxiety, anxiousness, apprehension, apprehensiveness, disquiet, feverishness, franticness, freneticism, hand-wringing, perturbation, restlessness, trepidation, unease, uneasiness, upset, worry; nerves, tenseness, tension; butterflies, dither, heebie-jeebies, jimjams, jitters, shakes, shivers, williesNear Antonyms confidence, self-assurance, self-confidence, sureness; control, self-control; aplomb, calm, calmness, collectedness, composure, coolness, ease, easiness, equanimity, equilibrium, imperturbability, poise, repose, self-possession, tranquillity (or tranquility), tranquilness