Learner's definition of INTENSE
[more intense; most intense]
1 : very great in degree : very strong
intense [=extreme] heat/cold/pain/pressure
He shielded his eyes from the intense flash of light.
She has an intense dislike for/of her husband's friend.
2 a : done with or showing great energy, enthusiasm, or effort
b of a person : very serious
After many years of intense study, he received his medical degree.
an intense effort
School reform is a subject of intense debate.
The work requires intense concentration.