sure

Having or feeling no doubt or uncertainty; confident and assured.

“was sure (or certain) she had seen it”

“was very sure in his beliefs”

Physically secure or dependable.

“a sure footing”

“was on sure ground”

Certain to occur; destined or inevitable.

“sudden but sure regret”

“he is sure to win”

Impossible to doubt or dispute.

“indisputable (or sure) proof”

Exercising or taking care great enough to bring assurance.

“be sure to lock the doors”

Reliable in operation or effect.

“a sure way to distinguish the two”

“wood dust is a sure sign of termites”

(of persons) worthy of trust or confidence.

“a sure (or trusted) friend”

Certain not to fail.

“a sure hand on the throttle”

Infallible or unfailing.

“a sure (or true) sign of one's commitment”

Definitely or positively (`sure' is sometimes used informally for `surely').

“the results are surely encouraging”

“it's going to be a good day for sure”