English dictionary definition of:



  • 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
  • physically secure or dependable
  • reliable in operation or effect
  • (of persons) worthy of trust or confidence
  • infallible or unfailing
  • certain not to fail
  • impossible to doubt or dispute


  • definitely or positively (`sure' is sometimes used informally for `surely')


certain   certainly   indisputable   surely   trusted  

Spellzone course content

View spelling list Common words - set 2 and learn about the word sure in the Spellzone English spelling course, Unit 18. Irregular common words – common errors e.g. would, who, does.

Scrabble score for sure

Scrabble score = 4

generated at 16:12:38 on 11-02-20

Spelling dictionary home

Sign up to remove this advert

"This is a fantastic opportunity for our students!  I'm sure Spellzone will be invaluable in helping them to improve their spellings and therefore improve the quality of their writing in all subject areas!"

Teacher, High School, UK