The definition of ostensibly is purportedly or apparently. The
synonyms that can be used with ostensibly include allegedly,
supposedly, outwardly and so many others.
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Yes, evidently is an adverb. It means apparently or
seemingly.
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She apparently performed oral sex, which Clinton ostensibly did
not consider sex in his particularly narrow definition
(intercourse).
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It is an adverb meaning to give the impression of having a
certain quality; apparently.