FluentPlex

sure

/ʃʊɹ/ adjective A1
  1. Physically secure and certain, non-failing, reliable. · This investment is a sure thing.· The bailiff had a sure grip on the prisoner's arm.
  2. Certain in one's knowledge or belief. · Are you sure to succeed, as polls say? —Well, I am at least certain of making it to the podium this time.· He was sure of being a finalist.
  3. Certain to act or be a specified way. · Be sure to lock the door when you leave.
  4. Certain to obtain something. · Many people book early in order to be sure of the best seats.

Comparative surer · Superlative surest

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From the library

“For,” he said to himself, “if it is the head, I am sure I shall not be given a heart, since a head has no heart of its own and therefore cannot feel for me.
The Wonderful Wizard of Oz, p. 72 · B2
“Yes, to be sure I am.
The Count of Monte Cristo, p. 16 · C1
“I am sure _I_ know none so handsome; but in the gallery upstairs you will see a finer, larger picture of him than this.
Pride and Prejudice, p. 276 · B2
Elizabeth could not help saying, “It is very much to his credit, I am sure, that you should think so.”
Pride and Prejudice, p. 277 · B2

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Words, meanings, pronunciations and translations from Wiktionary (CC BY-SA 4.0); how common each word is from wordfreq. Made into this dictionary by FluentPlex.