noun
: the quality or state of being lighthearted
scientists are unduly sensitive to any suspicion of lightheartedness in serious journals — T.H.Savory
smiled innocently at their lightheartedness — Robert Hichens
noun
: the quality or state of being lighthearted
scientists are unduly sensitive to any suspicion of lightheartedness in serious journals — T.H.Savory
smiled innocently at their lightheartedness — Robert Hichens
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012