Vastly

//ˈvæstli// adv

Definitions

Adverb
  1. 1
    Greatly, in a vast manner.

    "“I have visited my quarters, and find them very comfortable.[…]Steerage is like everything else maritime[…]vastly improved since Robert Louis Stevenson took his trip third class to New York.”"

Adverb
  1. 1
    to an exceedingly great extent or degree wordnet

Etymology

From vast + -ly.

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