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moon·struck(mo͞on′strŭk′) also moon·strick·en (-strĭk′ən)
1. Dazed or distracted with romantic sentiment.
2. Mentally deranged; crazy.
[From the belief that the moon caused mental disorders.]
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Afflicted with or exhibiting irrationality and mental unsoundness:
brainsick, crazy, daft, demented, disordered, distraught, dotty, insane, lunatic, mad, maniac, maniacal, mentally ill, off, touched, unbalanced, unsound, wrong.
Chiefly British: crackers.
Law: non compos mentis.