"surer" in the adjective sense
1. certain, sure
having or feeling no doubt or uncertainty confident and assured
"felt certain of success"
"was sure (or certain) she had seen it"
"was very sure in his beliefs"
"sure of her friends"
2. certain, sure
exercising or taking care great enough to bring assurance
"be certain to disconnect the iron when you are through"
"be sure to lock the doors"
3. certain, sure
certain to occur destined or inevitable
"he was certain to fail"
"his fate is certain"
"In this life nothing is certain but death and taxes"- Benjamin Franklin
"he faced certain death"
"sudden but sure regret"
"he is sure to win"
4. sure
physically secure or dependable
"a sure footing"
"was on sure ground"
5. certain, sure
reliable in operation or effect
"a quick and certain remedy"
"a sure way to distinguish the two"
"wood dust is a sure sign of termites"
6. sure, trusted
of persons) worthy of trust or confidence
"a sure (or trusted) friend"
7. sure
infallible or unfailing
"a sure (or true) sign of one's commitment"
8. sure
certain not to fail
"a sure hand on the throttle"
9. indisputable, sure
impossible to doubt or dispute
"indisputable (or sure) proof"
Source: WordNet® (An amazing lexical database of English)
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