1. to a very great extent or degree; enormously

Examples

• The new system is vastly superior to the old one.
• Her knowledge of the subject has improved vastly since last year.
• The population of the city has grown vastly over the past decade.
• This approach is vastly different from what we tried before.
• The company’s profits increased vastly after the merger.
• He was vastly outnumbered by his opponents.
• The quality of education varies vastly between schools.