flighty

1 easily excited by nature you have to be quiet while the deer are grazing, as they are flighty animals and will run if they hear you Synonyms fiddle-footed, excitable, fluttery, high-strung, hyper, hyperactive, hyperexcitable, hyperkinetic, jittery, jumpy, nervous, skittery, skittish, spasmodic, spookyRelated Words hot-blooded, mercurial, temperamental, unstable, volatile, volcanic; anxious, edgy, flibbertigibbety, nervy, tense, uptight; emotional, emotionalistic, hypersensitive, intense, sensitive, soulful; dramatic, histrionic, melodramatic; irascible, irritable, perturbable, prickly, testy, touchyNear Antonyms calm, collected, cool, serene, tranquil; easy, easygoing, laid-back, relaxedAntonyms imperturbable, nerveless, unexcitable, unflappable, unshakable

2 lacking in seriousness or maturity flighty and giggly preteens at their first dance Synonyms birdbrained, ditzy (or ditsy), dizzy, featherbrained, giddy, frivolous, frothy, futile, goofy, harebrained, light-headed, light-minded, puerile, scatterbrained, silly, yeastyRelated Words fatuous, foolish, inane, nonsensical, thoughtless, witless; crazy, daffy, daft, fruity; exuberant, flippant, fluttery, giggly, happy, light, lighthearted, playful; sappy, shallow, superficialNear Antonyms grave, melancholy, somber (or sombre), thoughtful; dignified, heavy, no-nonsense, sedate, severe, solemn, staidAntonyms earnest, serious, serious-minded, sober, unfrivolous