Given to capricious or unstable behavior.(adjective)
Characterized by irresponsible or silly behavior.(adjective)
Easily excited; skittish.(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "flighty" in a sentence
"America's obsession with the superficial and the flighty is a reflection of its excessive preoccupation with entertainment and glamour."
"Thus the readers meet the heroine, immediately after the call her flighty best friend and soon afterward the vampire-author."
"When your faculty of awareness is flighty – in other words, when your mind gets distracted to many things – direct your way of gazing and faculty of imagination at the black drop."