Bubbly/ˈbʌbli/ Definition 1 of 3Pro Tip 1/3Positive Emotions Use 'bubbly' to describe people who are noticeably happy and energetic. Her bubbly laughter filled the room. Pro Tip 2/3Informal Context 'Bubbly' is casual and best used in informal conversations or writing. My friend is so bubbly, she makes everyone smile. Pro Tip 3/3Personality Trait When describing a 'bubbly personality', it suggests a consistently cheerful demeanor. People are drawn to her bubbly personality.