1. (obsolete) Crazy or insane when affected by the phases of the Moon.
  2. (by extension) Showing irrational behaviour, especially of a romantic or sentimental nature.
    • 1902, William James, The Varieties of Religious Experience, Lectures 4 & 5:
      [W]e can also overlook the verbiage of a good deal of the mind-cure literature, some of which is so moonstruck with optimism and so vaguely expressed that an academically trained intellect finds it almost impossible to read it at all.
    • 1925, Sinclair Lewis, Arrowsmith, Chapter 21, IV:
      The full moon was spacious now behind the maples. The seedy Pickerbaugh domain was enchanted […] and over all the world was the proper witchery of moonstruck love.
  3. (obsolete) Made sick, or (like fishes) unsuitable for food, by the supposed influence of the Moon.
  • moonstricken

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