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Briefly

/ˈbriːfli/

For a short period or using few words.

Synonyms:

I listened for a minute or two, then replied briefly.

'Don't!' advised Bingo, briefly.

To this amorous address Miss Brass briefly responded 'Bother!'

Originating in Middle English: from the Old French brief, derived from Latin brevis meaning short. The suffix -ly forms the adverb.

19 mentions per 1 million words

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Hint: Frequency according to COCA