silly
Lacking in common sense or judgment; foolish. / Playful and lighthearted in a way that is amusing.
Adjective
comp: silliersup: silliest
This word carries a light, often affectionate tone when describing behavior. It suggests a lack of seriousness rather than a lack of intelligence. When used for a child or a partner, it often implies a charming or whimsical quality that evokes a smile.
In a critical context, it denotes a triviality that is frustrating or absurd. It describes things that are not worth the time or effort spent on them, making it less harsh than calling something stupid or idiotic, but still dismissive of the logic involved.