flighty
1. [ adjective ] irresponsibly frivolous
Synonyms: flyaway
Examples:

"flighty young girls"

Related terms: frivolous
2. [ adjective ] absent-mindedly irresponsible
Synonyms: head-in-the-clouds scatterbrained
Examples:

"he said I was too flighty to be a good supervisor"

Related terms: irresponsible
Similar spelling:   flight
  flyweight
  flighted
  flightless
  flagstone
  flagstaff
  Flag_Day