Strongly
来自Big Physics
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Old English, of Germanic origin; related to Dutch and German streng, also to string.
wiktionary
From Middle English strongliche, strangliche, from Old English stranglīċe(“strongly”), equivalent to strong + -ly.
etymonline
strongly (adv.)
Old English stranglice "firmly, stoutly, boldly, bravely;" see strong (adj.) + -ly (2).