Gargantuan is a related term of weighty.
As adjectives the difference between gargantuan and weighty
is that gargantuan is (obsolete) of the giant gargantua or his appetite while weighty is having weight; heavy; ponderous; as, a weighty body.
gargantuan
English
Adjective
(
en adjective)
(obsolete) Of the giant Gargantua or his appetite.
Huge; immense; tremendous.
Of a tremendous size, volume, degree, etc.
Synonyms
* colossal
* enormous
* giant
* huge
* humongous, humungous
* immense
* See also
References
* (etymology) Gourd, Pumpkin. See Budge Ref, p 803A; (from 'Rev 12'--Revue Egyptologique publiee sous la direction de MM Brugsch, F Chabas, and Eug. Revillout (vol I-XIV))
weighty
Adjective
(er)
Having weight; heavy; ponderous; as, a weighty body.
Adapted to turn the balance in the mind, or to convince; important; forcible; serious; momentous.
Rigorous; severe; afflictive.