heaviness

noun

1.
the property of being comparatively great in weight
weightfulness weightiness
Antonym:
lightness
Derived from:
heavy
2.
persisting sadness
Derived from:
heavy
3.
an oppressive quality that is laborious and solemn and lacks grace or fluency
ponderousness
Derived from:
heavy
4.
used of a line or mark
thickness
Derived from:
heavy
5.
unwelcome burdensome difficulty
burdensomeness onerousness oppressiveness
Derived from:
heavy