adverb, adverb taking the 'to' particle, noun or participle which takes 'suru'
clearly; distinctly; in sharp relief
Describes something that stands out visually or figuratively with clear, sharp contours, often used with 見える, 浮かぶ, or 写る. Mimetic word.
山の稜線がくっきりと見える。
The mountain ridge is clearly visible.
彼の顔が写真にくっきり写っていた。
His face appeared distinctly in the photo.