Etymology
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extremely (adv.)

1530s, from extreme + -ly (2). Originally "with great severity," later more loosely, "in extreme degree" (1570s).

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Definitions of extremely

extremely (adv.)
to a high degree or extent; favorably or with much respect;
extremely interesting
Synonyms: highly
extremely (adv.)
to an extreme degree;
extremely unpleasant
extremely cold
Synonyms: exceedingly / super / deathly
From wordnet.princeton.edu