(linguistics) A form of a word with a stronger or more forceful sense than the root on which the intensive is built.

A course taught intensively.

Thorough; to a great degree; with intensity.

Demanding; requiring a great amount of work etc.

Highly concentrated.

(obsolete) Stretched; allowing intension, or increase of degree; that can be intensified.

Characterized by persistence; intent; assiduous.

(grammar) Serving to give force or emphasis.

(medicine) Related to the need to manage life-threatening conditions by means of sophisticated life support and monitoring.