In slang, “unserious” is used to describe someone or something that lacks seriousness, dedication, or a sincere attitude. It often implies a playful or carefree demeanor, sometimes bordering on being flippant or not taking things seriously. This term can be applied to various contexts, including personal behavior, work ethic, or situations where a more serious approach is expected.

“Unserious” captures the essence of a light-hearted or nonchalant approach, emphasizing a lack of earnestness or commitment in a given situation.

Example

“His unserious attitude during the meeting was evident when he started making jokes instead of addressing the important issues on the agenda.”