We found 23 dictionaries that define the word vastly:

General (20 matching dictionaries)

1. vastly: Longman Dictionary of Contemporary English
2. vastly: Merriam-Webster
3. vastly: Oxford Learner's Dictionaries
4. vastly: Collins English Dictionary
5. vastly: Vocabulary.com
6. Vastly, vastly: Wordnik
7. vastly: Cambridge Advanced Learner's Dictionary
8. vastly: Wiktionary
9. vastly: Dictionary.com
10. vastly: Cambridge Essential American English Dictionary
11. Vastly: Online Plain Text English Dictionary
12. vastly: Webster's Revised Unabridged, 1913 Edition
13. vastly: Rhymezone
14. Vastly: AllWords.com Multi-Lingual Dictionary
15. vastly: Webster's 1828 Dictionary
16. vastly: FreeDictionary.org
17. vastly: Mnemonic Dictionary
18. vastly: TheFreeDictionary.com

Art (1 matching dictionary)

19. Shakespeare Glossary (No longer online)

Business (1 matching dictionary)

20. vastly: Legal dictionary

Medicine (1 matching dictionary)

21. vastly: Medical dictionary

(Note: See vast as well.)

Definitions from Wiktionary ( ) ▸ adverb:  Greatly, in a vast manner. Similar: immensely, bigly, greatly, vastily, superimmensely, grandly, largely, gigantically, extensively, ginormously, more... Opposite: tiny, small, miniscule Types: extremely, enormously, greatly, tremendously, hugely, more... Phrases: vastly different, vastly different areas, looks vastly different, more... Colors:     azure,     cerulean,     indigo,     midnight blue,     sky blue, more... ▸ Words similar to vastly ▸ Usage examples for vastly ▸ Idioms related to vastly ▸ Wikipedia articles (New!) ▸ Words that often appear near vastly ▸ Rhymes of vastly ▸ Invented words related to vastly