(ש"ע) קלות ראש, זלזול

n. lack of seriousness, frivolity, flightiness, silliness

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Noun
1. feeling an inappropriate lack of seriousness
(antonym) gravity, solemnity
(hypernym) feeling
(hyponym) gaiety, playfulness
2. lightness of manner
(hypernym) frivolity, frivolousness
(hyponym) flippancy, light-mindedness

(n.)
The quality of weighing less than something else of equal bulk; relative lightness, especially as shown by rising through, or floating upon, a contiguous substance; buoyancy; -- opposed to gravity.
  

(n.)
Lack of steadiness or constancy; disposition to change; fickleness; volatility.
  

(n.)
Lack of gravity and earnestness in deportment or character; trifling gayety; frivolity; sportiveness; vanity.
  

n.
1. lightness
ہلکا پن, سبکي, اوچھا پن
2. of temper
چھچھورا پن, لڑکپن, نامسجھي, تلون مزاجي
3. inconstancy
بےثباتي, بےوفائي, چنچلتائي, تلون