Strained; tightly drawn. / Strict, very close or earnest. / Extreme in degree; excessive. / Extreme in size or strength. / Stressful and tiring. / Very severe. / Very emotional or passionate.

In an intense manner. / To an intense degree, extremely.

The characteristic of being intense; intensity.

comparative form of intense: more intense

plural of intenseness

The condition of being intensive.

Thorough; to a great degree; with intensity. / Demanding; requiring a great amount of work etc. / Highly concentrated.

(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.

plural of intensity

In an intensive way.