levity

This term describes a lightness of spirit or mood that often clashes with a serious environment. It carries a subtle tension between being refreshing and being inappropriate, as it frequently implies a failure to maintain the gravity required by a specific social or formal occasion. In a physical sense, the word refers to the property of rising or floating. While this usage is less common in daily conversation than the behavioral sense, it remains a precise term in scientific or philosophical discussions regarding buoyancy and the opposite of gravity.