Hopefully

wiktionary

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From hopeful +‎ -ly. (Cf. German hoffentlichit is to be hoped.)

etymonline

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hopefully (adv.)

1630s, "in a hopeful manner, with grounds of expectation for success," from hopeful + -ly (2). As a replacement for the admittedly awkward it is to be hoped that, attested from 1932 but avoided by careful writers.