different between featherbrained vs harebrained

English

featherbrained (comparative more featherbrained, superlative most featherbrained)

hare +? brained

harebrained (comparative more harebrained, superlative most harebrained)

(of an idea or plan etc) Absurd, foolish or stupid.
- 2008, Sarah McCarty, Promises Reveal, Penguin (?ISBN)
  “Now why do I get the feeling we're not talking about the harebrained plan you came up with?” “It wasn't harebrained.” “Did it have you going within twenty feet of a whorehouse at night, unchaperoned?” He knew darn well it did.
(of a person) Frivolous and silly; featherbrained or scatterbrained.

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