Definitions

1. adjective

infatuated with or fascinated by the moon; melancholic, especially in a romantic or poetic sense

“She was moonsick, dreaming of the full moon shining over the rolling hills.”

2. noun

a person who is infatuated with or fascinated by the moon; a melancholic, especially in a romantic or poetic sense

“The poet was known to be a bit moonsick, often writing about the mysteries of the night sky.”