No, it's an adverb, the adjective is probable.
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One adjective for for probability is probable.
The probability is 0.The probability is 0.The probability is 0.The probability is 0.
The probability is 1.The probability is 1.The probability is 1.The probability is 1.
For any event A, Probability (not A) = 1 - Probability(A)
They are both measures of probability.