harebrain
nounEtymology From hare + brain.
1
A person who lacks good sense; one who is foolish and reckless.
- ...rash harebrain treating matters that require age and gravity;1872, Thomas Carlyle, Critical and Miscellaneous Essays - Volume 3, page 452:
- At the moment she was watching something behind my back, undoubtedly that harebrain who was hanging over the street.1977, Vasa D. Mihailovich, White Stones and Fir Trees:
1 more example
- He smiled uncontrollably while driving; and then, thought that other drivers looking at his face would conclude there goes an unhinged harebrain.2014, Dean O. Holiday, The Unfortunate Gift: