adverb, adverb taking the 'to' particle, noun or participle which takes 'suru'
Describes a subtle, gentle degree of something, often a sensory quality like warmth, color, or scent. Commonly used with と and sometimes with する.
ほんのりと温かいスープを飲んだ。
I drank the slightly warm soup.
彼女の頬がほんのり赤くなった。
Her cheeks turned faintly red.