1. a person who behaves in a listless or dreamy manner; someone who daydreams or acts absent-minded
Usage: informal
2. a person who gazes at the moon or is fascinated by the moon
Usage: informal; rare

Examples

• He's such a mooner; he never pays attention in class.
• The mooner stared out the window instead of finishing her homework.
• Don't be a mooner—focus on what you're doing.
• She became a mooner after the breakup, lost in her own thoughts.
• The old mooner spent his evenings gazing at the night sky.