1. Lightness（轻盈性） 核心义：物理/精神层面的轻质状态 语体：中性偏褒义 典型搭配：～ of being（存在之轻）/～ in movement（动作轻盈） 例：The dancer's lightness amazed the audience.
2. Light-mindedness（轻浮心态） 核心义：缺乏严肃思考的心理倾向 语体：明显贬义 典型搭配：youthful～（年轻的轻率）/dangerous～（危险的轻慢） 例：His light-mindedness in handling state affairs caused public outrage.
3. Levity（轻佻举止） 核心义：不合时宜的轻松表现 语体：正式语境中的批评用语 典型搭配：unseemly～（不得体的轻浮）/moment of～（片刻的轻率） 例：The judge reprim ...(以上内容有节略,please sign in for more)500
【Lightness】 , 【light-mindedness】 , 【levity】 , 【frivolity】 , 【flippancy】 , 【volatility】 , 【flightiness】 are comparable when denoting the quality, manner, or attitude of one who is irresponsibly gay or indifferent especially when seriousness is expected.
【Lightness】 implies a general lack of weight or seriousness (as in character, mood, conduct, or speech). The term may further imply instability or carefree heedlessness or indifference to the seriousness of a situation.
【Light-mindedness】 , even more than 【lightness】 , suggests a temperamental lack of seriousness or stability.
【Levity】 usually suggests more specifically trifling or unseasonable gaiety.
【Frivolity】 adds to 【lightness】 the implication of empty or idle speech or conduct; the term often carries a strong connotation of triviality or of pettiness, but its most frequent implication is that of such indulgence in meaningless gaieties that serious employments are disregarded.
【Flippancy】 applies especially to unbecoming 【levity】 or pertness in speaking of or in dealing with serious things.
【Volatility】 implies such 【lightness】 or fickleness of disposition as precludes long or serious dwelling upon any one idea or plan.
【Flightiness】 may imply extreme 【volatility】 , often with a suggestion of loss of mental balance, but it often suggests extreme capriciousness or a gay whimsicality characteristic of one who is not long contented with what he has or does.
