Webster's English Dictionary

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lightness

1. light.ness n 1: the quality or state of being illuminated : ILLUMINATION 
    2: the attribute of object colors by which the object appears to reflect 
   or  transmit more or less of the incident light
2. light.ness n 1: the quality or state of being light in weight  2: LEVITY 
    3a: NIMBLENESS  3b: an ease and gaiety of style or manner  4: a lack of 
   weightiness or force : DELICACY VOLATILITY, FLIGHTINESS mean gaiety or 
   indifference when seriousness is expected. LIGHTNESS implies a lack of 
   weight and seriousness in character, mood, or conduct; LEVITY suggests 
   trifling or unseasonable gaiety; FRIVOLITY suggests irresponsible 
   indulgence in gaieties or in idle speech or conduct; FLIPPANCY implies an 
   unbecoming levity esp. in speaking of grave or sacred matters; VOLATILITY 
   implies such fickleness of disposition as prevents long attention to any 
   one thing; FLIGHTINESS implies extreme volatility that may approach loss of 
   mental balance SYN syn LIGHTNESS, LEVITY, FRIVOLITY, FLIPPANCY,