Shortly

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Old English scortlīce (see short, -ly2).

wiktionary

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From Middle English schortly, schortliche, from Old English sċortlīċe(“shortly; before long; soon”), equivalent to short +‎ -ly.

etymonline

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shortly (adv.)

Old English scortlice "briefly," also, in late Old English, "in short time;" from short (adj.) + -ly (2).