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certainly vs sure

sure vs certainly

certainly is not an adjective while sure is an adjective.

certainly and sure both are adverbs.

Word NounAdjectiveVerbAdverb
certainly No No No Yes
sure No Yes No Yes
As adverbs, certainly and sure are synonyms defined as:
  • certainly and sure: definitely or positively (`sure' is sometimes used informally for `surely')
Other synonyms of certainly include for certain, for sure, sure as shooting, sure enough, surely.
certainly (adjective) sure (adjective)
having or feeling no doubt or uncertainty; confident and assured
certain to occur; destined or inevitable
exercising or taking care great enough to bring assurance
reliable in operation or effect
physically secure or dependable
certain not to fail
infallible or unfailing
(of persons) worthy of trust or confidence
impossible to doubt or dispute
certainly (adverb) sure (adverb)
definitely or positively (`sure' is sometimes used informally for `surely') definitely or positively (`sure' is sometimes used informally for `surely')
Difference between certainly and sure

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