surer

/SH UH1 R ER0/
adjective
  1. 1

    Physically secure and certain, non-failing, reliable.

    โ€œThis investment is a sure thing.ย ย  The bailiff had a sure grip on the prisoner's arm.โ€

  2. 2

    Certain in one's knowledge or belief.

    โ€œHe was sure she was lying.ย ย  I am sure of my eventual death.ย ย  John was acting sure of himself but in truth had doubts.โ€

  3. 3

    Certain to act or be a specified way.

    โ€œBe sure to lock the door when you leave.โ€

  4. 4

    Free from danger; safe; secure.

  5. 5

    Betrothed; engaged to marry.

Source: https://en.wiktionary.org/wiki/sure, https://en.wiktionary.org/wiki/surer