こっそり
kossori
secretly, stealthily
JLPT N3 adverbExample sentences
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Dorobou wa kossori ie ni haitsu ta.
The thief slipped into the house.
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Kare wa kossori to uraguchi e idou shi ta.
He sneaked around to the back door.
Example sentences from the Tatoeba Project, CC-BY 2.0 FR.