Wiktionary
flightiest
a. (en-superlative of: flighty)
WordNet
flighty
adj. irresponsibly frivolous; "flighty young girls" [syn: flyaway]
absent-mindedly irresponsible; "he said I was too flighty to be a good supervisor" [syn: head-in-the-clouds, scatterbrained]
[also: flightiest, flightier]
flightiest
See flighty