The word “vastly” has 2 syllables: vast-ly.
It's pronounced as /ˈvæstli/.
What is synonym and antonym for vastly?
In the thesaurus, “vastly” has 30 synonyms and 4 antonyms.
Here are synonyms and antonyms for vastly along with examples of usage in sentences.
On this page you'll find 34 synonyms, antonyms, or another words to vastly, such as: badly, considerably, damn, damned, desperately, enormously, exceedingly.
Make sure to choose synonyms and antonyms that are appropriate for the context of the sentence.