Yes, it is. It is related to the verb extend and the noun extent, and means of some appreciable number, area, or range.
Extensive already is an adjective.
The noun form of the adjective 'extensive' is extensiveness.
Extensive is an adjective, and use is a noun.
"Extensive" is an adjective. Example use: "Despite extensive discussions, the cause of Arab-Israeli peace has made no recent progress."
The word extensive is an adjective. It describes something that is widespread.
Quite is an adverb; interesting is an adjective.
the suffix in the word extensive is exten
The word 'extensively' is the adverb form for the adjective extensive.The noun form for the adjective extensive is extensiveness.A related noun form is extension.
Exhaustive, thorough, inclusive, complete, extensive, widespread, or large are synonyms for the adjective comprehensive.
The adjective is vast. Some synonyms could be extensive, enormous, or mammoth.
The media irresponsibly reported an unconfirmed rumor, causing an unnecessary, widespread panic. The word widespread is an adjective, and the word extensive is a synonym.
The verb form of the adjective broad is broaden.