"A massive comet or asteroid appears to have ended the era of the dinosaurs."
"Compared to its counterparts from World War II, the Abrams main battle tank is truly massive."
synonyms:
bulky, heavy, hefty, substantial
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, weighty, colossal, enormous, gargantuan, giant, gigantic, great, huge, mahoosive, titanic, consequential, meaningful, overwhelming, significant, awesome, super, excellent, stupendous