adverb
1. with considerable certainty; without much doubt (Freq. 112)
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He is probably out of the country
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in all likelihood we are headed for war
• Derived from adjective: ↑probable
2. easy to believe on the basis of available evidence
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he talked plausibly before the committee
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he will probably win the election
• Syn: ↑credibly, ↑believably, ↑plausibly
• Ant: ↑incredibly (for: ↑credibly)
• Derived from adjective: ↑probable, ↑plausible (for: ↑plausibly), ↑believable (for: ↑believably), ↑credible (for: ↑credibly)
Useful english dictionary. 2012.