I suggest using “intensively” when referring to in-depth research involving intense effort narrowly focused on a specific issue and perhaps conducted by a small group of researchers.

Whats the meaning for intensively?

(Entry 1 of 2) : of, relating to, or marked by intensity or intensification: such as. a : highly concentrated intensive study. b : tending to strengthen or increase especially : tending to give force or emphasis intensive adverb.

What is the difference between extensively and intensively?

As adverbs the difference between intensively and extensively. is that intensively is in an intensive way while extensively is in an extensive manner, widely.