Flighty
Pronunciation : Flight"y
Part of Speech : a.
Definition : 1. Fleeting; swift; transient. The flighty purpose never is o'ertook, Unless the deed go with it. Shak.
2. Indulging in flights, or wild and unrestrained sallies, of imagination, humor, caprice, etc.; given to disorder Proofs of my flighty and paradoxical turn of mind. Coleridge. A harsh disciplinarian and a flighty enthusiast. J. S. Har
Source : Webster's Unabridged Dictionary, 1913