Adverbial extremely has 4 senses
  1. highly, extremely - to a high degree or extent; favorably or with much respect; "highly successful"; "He spoke highly of her"; "does not think highly of his writing"; "extremely interesting"
  2. extremely - to an extreme degree; "extremely cold"; "extremely unpleasant"
    Derived from adjective
    extreme1
  3. super, extremely - to an extreme degree; "the house was super clean for Mother's visit"
  4. exceedingly, passing, extremely - to an extreme degree or extent; "his eyesight was exceedingly defective"
    Derived from adjective extreme1
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