surety

/ˈʃʊrəti/
noun
  1. A person who agrees to be responsible for another person's debt or obligation if that person fails to pay or perform.
    • My uncle acted as a surety for my first apartment lease.
    • Without a surety, the contractor could not get the building permit.
    • The bank required a surety before approving the loan for the small business.
  2. Something given as a guarantee that a promise will be kept; a pledge or security.
    • He offered his car as a surety for the loan.
    • They demanded a cash surety before releasing the goods.
    • The court accepted the property deed as surety for his bail.
  3. The state of being certain or confident; certainty.
    • He felt a deep surety that he had made the right choice.
    • There is no surety that the weather will be good for the picnic.
    • She spoke with surety about the outcome of the experiment.
Antonyms