Carefully
来自Big Physics
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Old English carful (see care, -ful).
wiktionary
From Middle English carfulli, carefulliche, from Old English carfullīċe, ċearfullīċe(“carefully, diligently”), equivalent to careful + -ly.
etymonline
carefully (adv.)
Old English carfullice "sorrowfully;" see careful + -ly (2). Meaning "heedfully" is in late Old English.