weighty

adj

1.
having relatively great weight; heavy
massy unlight
Antonym:
weightless
Derived from:
weight weightiness
2.
powerfully persuasive
cogent telling
Derived from:
weightiness
3.
of great gravity or crucial import; requiring serious thought
grave grievous heavy
Derived from:
weight weightiness
4.
weighing heavily on the spirit; causing anxiety or worry
Derived from:
weight
5.
excessively fat
corpulent obese rotund
Derived from:
weightiness