Synonyms of weighty in English:

weighty


See definition of weighty

adjective

1‘a weighty tome of rules and regulations’

SYNONYMS
heavy, massive, thick, bulky, hefty, cumbersome, clumsy, ponderous, overweight
ANTONYMS

light

2‘a weighty subject’

SYNONYMS
important, of great import, of great importance, significant, of significance, momentous, of moment, consequential, of consequence, far-reaching, key, major, vital, critical, crucial, life-and-death, high-priority, decisive, serious, grave, solemn
no joke, no laughing matter
ANTONYMS

unimportant, trivial

3‘it is a rather weighty responsibility to shoulder’

SYNONYMS
burdensome, onerous, heavy, oppressive, stressful, taxing, troublesome, worrisome, vexatious

4‘weighty arguments’

SYNONYMS
compelling, cogent, strong, forceful, powerful, potent, convincing, plausible, effective, efficacious, effectual, sound, valid, well founded, telling
impressive, persuasive, influential, authoritative
ANTONYMS

weak