vastly

vastly — adverb

1. by a large amount; to a degree that is clearly noticeable or significant, especi

1.adverbB2
Definition

by a large amount; to a degree that is clearly noticeable or significant, especially when comparing things or describing how much something has changed.

Example

The two building plans are vastly different in cost and complexity.

vastly + adjective (different)

Since taking classes, Hui's cooking skills have improved vastly.

vastly + verb (improved)

Common collocations
  • vastly different
  • vastly superior
  • vastly improved
  • vastly underestimated
  • vastly greater
  • vastly more complex
Synonyms
  • greatly

    more neutral and widely applicable; works with emotions and abstract qualities

  • hugely

    more informal; suggests a large metaphorical size

  • enormously

    similar register; very common in both speech and writing

  • tremendously

    slightly more formal; adds emphasis through connotation of impressive scale

Antonyms
  • slightly

    marks a small, barely noticeable degree

  • marginally

    suggests a very small difference, often in statistical or comparative contexts

Grammar Patterns

vastly + adjective

vastly + verb

vastly + comparative

Usage Note

Commonly pairs with adjectives expressing difference or scale (different, superior, greater, larger) and verbs of change or measurement (improve, increase, underestimate, vary). Less frequent with neutral descriptive adjectives (e.g. 'vastly happy' sounds unnatural).

Common Mistakes

I am vastly happy to meet you.
I am extremely happy to meet you.
'vastly' sounds unnatural with personal emotion adjectives that do not imply comparison or measurable degree.
The meal was vastly good.
The meal was very good.
'vastly' is not a general intensifier; it works best when there is a sense of scale, difference, or measurable change.

Word family

  • vast
    adjectiveB1
  • vastness
    nounB2

Synonym discussion

Sense: adverb/1

All four adverbs intensify degree, but they differ in the contexts they suit best. 'Greatly' is the most neutral and versatile — it pairs naturally with both comparison verbs (greatly improved) and emotion verbs (greatly appreciated). 'Hugely' carries a more informal, enthusiastic tone and often suggests a physical or metaphorical sense of largeness (hugely popular, hugely successful). 'Enormously' sits at a similar register to 'vastly' and is common in both writing and speech, though 'vastly' has a stronger connotation of a wide gap or margin between two things being compared. For example: ticket prices varied vastly (emphasizing the size of the gap) versus ticket prices varied greatly (focusing on the fact of variation). In emotional contexts, 'greatly' sounds natural ('I greatly admire her work') while 'vastly' would be odd.

greatly ↗hugely ↗enormously ↗vastly ↗

Common collocations

Phrases

  • vastly different from
  • vastly superior to

Etymology

LatinEnglish

'Vastly' comes from the adjective 'vast' (from Latin 'vastus', meaning 'empty, desolate, immense') plus the adverbial suffix '-ly'. In Latin, 'vastus' carried a sense of 'devastating emptiness', which later shifted in English toward the idea of 'extremely large in size or degree'. The adverbial form 'vastly' emerged in the 16th–17th centuries as an intensifier, first used in descriptions of physical scale and later extending to abstract comparisons.