Gleeful means feeling or showing happiness and excitement.
When someone's gleeful, they often can't help but show it. You might see them smiling from ear to ear, laughing out loud, or even doing a little dance. If your friend just got their dream job, she'll probably be gleeful when you congratulate her. If you're watching a funny movie with friends and everyone's enjoying themselves, the atmosphere will likely be gleeful too.
Exuberantly or triumphantly joyful.
