(1):

(a.) Strained; tightly drawn; kept on the stretch; strict; very close or earnest; as, intense study or application; intense thought.

(2):

(a.) Extreme in degree; excessive; immoderate; as: (a) Ardent; fervent; as, intense heat. (b) Keen; biting; as, intense cold. (c) Vehement; earnest; exceedingly strong; as, intense passion or hate. (d) Very severe; violent; as, intense pain or anguish. (e) Deep; strong; brilliant; as, intense color or light.