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ex‧ten‧sive W3

1 large in size, amount, or degree :
The house stands in extensive grounds.
Fire has caused extensive damage to the island's forests.
the extensive use of pesticides
The house stands in extensive grounds.
Fire has caused extensive damage to the island's forests.
the extensive use of pesticides2 containing or dealing with a lot of information and details :
Extensive research is being done into the connection between the disease and poor living conditions.
Extensive research is being done into the connection between the disease and poor living conditions. —extensively adverb:
As a student, he travelled extensively in the Middle East.
As a student, he travelled extensively in the Middle East.