of, pertaining to, or characterized by intensity

intensive questioning.

tending to intensify; intensifying.

Medicine/Medical .

increasing in intensity or degree.

instituting treatment to the limit of safety.

noting or pertaining to a system of agriculture involving the cultivation of limited areas, and relying on the maximum use of labor and expenditures to raise the crop yield per unit area ( opposed to extensive ).

requiring or having a high concentration of a specified quality or element (used in combination)

Coal mining is a labor-intensive industry.

Grammar . indicating increased emphasis or force. Certainly is an intensive adverb. Myself in I did it myself is an intensive pronoun.

something that intensifies.

Grammar . an intensive element or formation, as -self in himself, or Latin -t? in iac-t?, I hurl from iac?, I throw.

adverb

exhaustively , thoroughly