adj. 25B6; adjective
a weighty tome : HEAVY, thick, bulky, hefty, cumbersome, ponderous.
a weighty subject : IMPORTANT, significant, momentous, consequential, far-reaching, key, major, vital, critical, crucial; serious, grave, solemn.
a weighty responsibility : BURDENSOME, onerous, heavy, oppressive, taxing, troublesome.
weighty arguments : COMPELLING, cogent, strong, forceful, powerful, potent, effective, sound, valid, telling; impressive, persuasive, convincing, influential, authoritative.
light, trivial, weak.