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Vastly vs Mostly - What's the difference?

vastly | mostly |

As adverbs the difference between vastly and mostly

is that vastly is greatly, in a vast manner while mostly is mainly or chiefly; for the most part; usually, generally, on the whole.

vastly

English

Adverb

(en adverb)
  • Greatly, in a vast manner.
  • *{{quote-book, year=1913, author=
    • , title=Lord Stranleigh Abroad , chapter=1 citation , passage=“I have visited my quarters, and find them very comfortable.

    Synonyms

    * exceedingly, extremely, highly, immensely, supremely, tremendously

    mostly

    English

    Alternative forms

    * mostlie (obsolete) * moastly (obsolete)

    Adverb

    (-)
  • Mainly or chiefly; for the most part; usually, generally, on the whole.
  • *{{quote-magazine, date=2013-06-29, volume=407, issue=8842, page=72-3, magazine=(The Economist)
    • , title= A punch in the gut , passage=Mostly , the microbiome is beneficial. It helps with digestion and enables people to extract a lot more calories from their food than would otherwise be possible. Research over the past few years, however, has implicated it in diseases from atherosclerosis to asthma to autism.}}
  • (obsolete) To the greatest extent; most.
  • * 1817 , , Northanger Abbey , [http://books.google.co.uk/books?id=mDUbXHRIbRIC&dq=northanger+abbey+search+austen&pg=PP1&ots=EDH1Xu36el&sig=J7fVUwXmydAD36S8oLTWv2-ICNk&hl=en&sa=X&oi=book_result&resnum=1&ct=result#PPA163,M1]:
    • She was to be their chosen visitor, she was to be for weeks under the same roof with the person whose society she mostly prized [...]!

    Synonyms

    * (mainly or chiefly) by and large, in the main, more often than not