intensive

Done with intensity or to a great degree; thorough.

Being made more intense.

Of agriculture: increasing the productivity of an area of land.

Of a word: serving to give emphasis or force.

Involving much activity in a short period of time; highly concentrated.

Of or pertaining to innate or internal intensity or strength rather than outward extent.

Chiefly suffixed to a noun: using something with intensity; requiring a great amount of something; demanding.

Chiefly in intensive care: of care or treatment: involving a great degree of life support, monitoring, and other forms of effort in order to manage life-threatening conditions.

That can be intensified; allowing an increase of degree.

Synonym of intense (“extreme or very high or strong in degree; of feelings, thoughts, etc.: strongly focused”).