Flightiness is a related term of liveliness.
As nouns the difference between flightiness and liveliness
is that flightiness is the quality of being flighty while liveliness is the quality of being lively; animation; energy.
flightiness
English
Noun
(-)
The quality of being flighty.
liveliness
English
Noun
(-)
The quality of being lively; animation; energy.