Dreamy or absent-minded, often lost in thought. She had a moony expression on her face as she stared out the window, lost in her own world.
Lit by the moon or suggestive of moonlight; moonlit. They walked along the moony beach, the waves gleaming silver under the night sky.
Resembling the moon in appearance, especially pale or round. A large, moony face peered through the doorway.
Silly, foolish, or weak-minded (archaic). Stop making those moony remarks and get back to work!