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Costly vs Mostly - What's the difference?

costly | mostly |

As an adjective costly

is of high cost; expensive.

As an adverb mostly is

mainly or chiefly; for the most part; usually, generally, on the whole.

costly

English

Adjective

(er)
  • Of high cost; expensive.
    • a costly activity
    a costly error
  • * {{quote-news
    • , year=2011 , date=October 15 , author=Michael Da Silva , title=Wigan 1 - 3 Bolton , work=BBC Sport citation , page= , passage=Individual mistakes proved costly for Wigan who, particularly after the half-time introduction of Hugo Rodallega, dominated for long periods.}}

    Antonyms

    * costlessly

    Anagrams

    *

    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