こっそり

こっそり
adverb
secretly; stealthily; quietly
1. secretly; stealthily; on the sly
Describes doing something quietly and secretly so as not to be noticed by others. Often implies a deliberate attempt to avoid detection.
こっそり部屋(へや)()た。
I slipped out of the room quietly.
(かれ)はこっそり手紙(てがみ)()んでいた。
He was reading the letter secretly.
(おや)()つからないようにこっそりお菓子(かし)()べた。
I ate snacks on the sly so my parents wouldn't find out.

こっそり describes doing something secretly or stealthily, deliberately trying not to be noticed. The tone is relatively mild — it can describe innocent secrecy, not just wrongdoing.

COMMON PATTERNS:

  • こっそり〜する: to do something secretly
  • こっそりと: variant with と particle (slightly more literary)
  • こっそり()()す: to sneak out
  • こっそり()べる: to eat on the sly

SIMILAR EXPRESSIONS:

  • こそこそ: sneakily (more negative, implies suspicious behavior)
  • ひそかに: secretly (literary, can mean "inwardly")
  • 内緒(ないしょ)で: in secret, confidentially
  • (ひそ)かに: in secret (formal/written)

USAGE:
こっそり often appears in lighthearted contexts: こっそりお菓子(かし)()べる (sneaking a snack). こそこそ sounds more suspicious and negative.