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certain

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1 known but not named

a certain person told me that today is your birthday

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2 having or showing a mind free from doubt

I'm certain that they'll arrive on time

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3 having been established and usually not subject to change

a certain percentage of the profits will go to charity

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4 impossible to avoid or evade

as he got older, the athlete began to feel the certain effects of the aging process on his body

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preventable
(also preventible)

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5 not likely to fail

chicken soup is grandma's certain cure for pretty much whatever ails you

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fallible

6 not capable of being challenged or proved wrong

up to this point there's been no certain evidence that a crime has been committed

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sure, certain, positive, cocksure mean having no doubt or uncertainty. sure usually stresses the subjective or intuitive feeling of assurance. felt sure that I had forgotten something certain may apply to a basing of a conclusion or conviction on definite grounds or indubitable evidence. police are certain about the cause of the fire positive intensifies sureness or certainty and may imply opinionated conviction or forceful expression of it. I'm positive that's the person I saw cocksure implies presumptuous or careless positiveness. you're always so cocksure about everything