Sorely

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Old English sārlīce (see sore, -ly2).

wiktionary

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From Middle English sorely, from Old English sārlīċ(adjective), sārlīċe(adverb); equivalent to sore +‎ -ly.

etymonline

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sorely (adv.)

Old English sarlice "grievously, mournfully, bitterly, painfully;" see sore (adj.) + -ly (2).