こ
 
っ
 
そ
 
り

adverb, adverb taking the と particle

Onomatopoeic or mimetic word.
  1. stealthily, secretly, in secret.

Variations

Pronunciation Kanji Kana Is Common
 
こ
 
っ
 
そ
 
り
こっそり ✔
 
コ
 
ッ
 
ソ
 
リ
コッソリ