a. 1. Consisting of flakes or of small, loose masses; lying, or cleaving off, in flakes or layers; flakelike. [ 1913 Webster ]
What showers of mortal hail, what flaky fires! Watts. [ 1913 Webster ]
A flaky weight of winter's purest snows. Wordsworth. [ 1913 Webster ]
2. prone to strange or erratic behavior; -- of persons. [ PJC ]
3. odd, unpredictable or unconventional; offbeat; whacky; -- of behavior. [ PJC ]
4. unpredictable, erratic, or unreliable; -- of machinery, especially electronic devices. “a flaky computer board.” [ PJC ]