Etymology
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weighty (adj.)

late 14c., "heavy;" late 15c., "important, serious, grave;" from weight (n.) + -y (2). Related: Weightiness.

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Definitions of weighty

weighty (adj.)
having relatively great weight; heavy;
a weighty package
a weighty load
weighty (adj.)
powerfully persuasive;
a weighty argument
Synonyms: cogent / telling
weighty (adj.)
of great gravity or crucial import; requiring serious thought;
the weighty matters to be discussed at the peace conference
Synonyms: grave / grievous / heavy
weighty (adj.)
weighing heavily on the spirit; causing anxiety or worry;
weighty problems
weighty (adj.)
excessively fat;
a weighty man
Synonyms: corpulent / obese / rotund
From wordnet.princeton.edu