こっそり stealthily N2 #9,485 Meanings こっそり · コッソリ adverb, adverb taking と, onomatopoeia stealthily; secretly; in secret In sentences Furigana こっそり家いえに忍しのび込こむ。 I steal into the house. #224131 こっそり彼かれにお金かねを返かえしたんだ。 I gave him back the money in secret. #9525075