他一直是个非常严肃认真、情感强烈的人。

He's always been very ___intense.

她性格强烈，充满了深刻的信念和激情。

She has an ___intense personality, full of deep convictions and passion.

辩论过程中，他严肃而专注的目光从未离开过对手。

During the debate, his ___intense gaze never left the opponent.