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sure vs certainly

certainly vs sure

sure is an adjective but certainly is not an adjective.

sure and certainly both are adverbs.

Word NounAdjectiveVerbAdverb
sure No Yes No Yes
certainly No No No Yes
As adverbs, sure and certainly are synonyms defined as:
  • sure and certainly: definitely or positively (`sure' is sometimes used informally for `surely')
Other synonyms of sure include for certain, for sure, sure as shooting, sure enough, surely.
sure (adjective) certainly (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
sure (adverb) certainly (adverb)
definitely or positively (`sure' is sometimes used informally for `surely') definitely or positively (`sure' is sometimes used informally for `surely')
Difference between sure and certainly

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