Definitions of intensive:

• noun:   a modifier that has little meaning except to intensify the meaning it modifies
• adjective:   characterized by a high degree or intensity; often used as a combining form

  Example: "The questioning was intensive"

• adjective:   of agriculture; intended to increase productivity of a fixed area by expending more capital and labor

  Example: "Intensive agriculture"

• adjective:   tending to give force or emphasis

  Example: "An intensive adverb"