1
as in confident
having or showing a mind free from doubt
are you absolutely sure that she said she was coming today?
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2
as in necessary
impossible to avoid or evade
the joke's a sure dud if you don't pause in the right places
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3
as in reliable
not likely to fail
a sure cure for the winter blues—a week in the Bahamas
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4
as in true
worthy of one's trust
a sister is a sure friend for life
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5
as in conclusive
not capable of being challenged or proved wrong
no sure evidence that life exists on other planets
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as in definitely
without any question
we sure could use your help here
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Merriam-Webster unabridged
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