adverb
slowly but steadily; gradually; little by little
Mimetic adverb describing a gradual, steady spread or increase, often of a liquid, feeling, or effect. Implies a quiet, persistent progression.
雨がじわっと地面にしみこんでいく。
The rain slowly soaks into the ground.
彼の言葉がじわっと心に響いた。
His words gradually sank into my heart.