Tending to break or separate into thin layers or pieces. The pastry was perfectly flaky, with layers that melted in the mouth.
Unreliable or inconsistent in behavior or performance. He's known to be a flaky friend, often canceling plans at the last minute.
Having or resembling flakes; covered with or consisting of flakes. The paint on the old house was flaky and peeling off in large sections.
Informal, eccentric or crazy in behavior or ideas. His flaky theories about alien conspiracies amused his friends.