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Countless vs Extensively - What's the difference?

countless | extensively |

As an adjective countless

is too many to count; innumerable or incalculable.

As an adverb extensively is

in an extensive manner, widely.

countless

English

Adjective

(head)
  • Too many to count; innumerable or incalculable
    • There is a countless number of stars

    extensively

    English

    Adverb

    (en adverb)
  • In an extensive manner, widely.
    • He has read and traveled extensively .
  • To a great extent.
    • He became more extensively involved than he intended.