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KEY: Certainly.
SYN: Surely, positively, unquestionably.
ANT: Possibly, probably, perhaps, contingently, doubtfully, occasionally.
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KEY: Certainty.
SYN: Assurance, demonstrableness, positiveness, unquestionableness, confidence, conviction.
ANT: Dubiousness, precariousness, casualty, vicissitude, uncertainty, irregularity, hesitation, doubt, misgiving, conjecture, indecision.
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KEY: Certify.