surer

Adjective

sure (comparative surer, superlative surest)

1. Physically secure and certain, non-failing, reliable.
   • This investment is a sure thing.

   Synonyms:

   certain, failsafe, reliable, sicker

2. Certain in one's knowledge or belief.
   • The very excess of the extravagance, in fact, by suggesting to the reader continually the mere aeriality of the entire speculation, furnishes the surest means of disenchanting him from the horror which might else gather upon his feelings.1827, Thomas De Quincey, On Murder Considered as one of the Fine Arts

   Synonyms:

   certain, positive, wis

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.
5. (obsolete) Free from danger; safe; secure.
   • Feare not: the Forreſt is not three leagues off, / If we recouer that, we are ſure enough.c. 1590–1591 (date written), William Shakespeare, “The Two Gentlemen of Verona”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and...
6. (obsolete) Betrothed; engaged to marry.
   • c. 1513-1518 (probably date written, published after 1535) Thomas More, History of King Richard III
     The king was sure to Dame Elizabeth Lucy, and her husband before God.

See all 11 meanings of sure