I. -nəs noun
Date: before 12th century
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 — compare brightness 2, hue 2c, saturation 4
II. noun
Date: 12th century
1. : the quality or state of being light especially in weight
2. : lack of seriousness and stability of character often accompanied by casual heedlessness
3.
a. : the quality or state of being nimble
b. : an ease and gaiety of style or manner
4. : a lack of weightiness or force : delicacy