Main entry: weighty
Definition: having relatively great weight; heavy
Usage: a weighty load; a weighty package
Antonyms: weightless
Definition: having little or no weight or apparent gravitational pull; light
Main entry: weighty, rotund, corpulent, obese
Definition: excessively fat
Usage: a weighty man
Main entry: weighty
Definition: weighing heavily on the spirit; causing anxiety or worry
Usage: weighty problems
Antonyms: light
Definition: of comparatively little physical weight or density
Antonyms: light
Definition: psychologically light; especially free from sadness or troubles
Antonyms: light
Definition: not great in degree or quantity or number
Antonyms: light
Definition: (physics, chemistry) not having atomic weight greater than average
Antonyms: light
Definition: of little intensity or power or force
Antonyms: light
Definition: of the military or industry; using (or being) relatively small or light arms or equipment
Main entry: grave, grievous, heavy, weighty
Definition: of great gravity or crucial import; requiring serious thought
Usage: grave responsibilities; faced a grave decision in a time of crisis; a grievous fault; heavy matters of state; the weighty matters to be discussed at the peace conference
Antonyms: unimportant
Definition: not important
Main entry: cogent, telling, weighty
Definition: powerfully persuasive
Usage: a cogent argument; a telling presentation; a weighty argument
Antonyms: dissuasive
Definition: deterring from action