1. superlative form of vast; extremely large in size, extent, or intensity
Usage: superlative form

Examples

• The Pacific is the vastest ocean on Earth.
• She had the vastest collection of books I’d ever seen.
• The vastest desert stretched endlessly before us.
• His knowledge was the vastest among all the professors.
• The vastest room in the mansion could hold 200 people.
• Antarctica contains the vastest ice sheets on the planet.