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covertly
01
ひそかに
with the intention of keeping actions, plans, or operations secret
例
The undercover agent observed the criminal activities covertly.
The hacker gained access to the system covertly, leaving no trace.
The spy infiltrated the organization covertly to gather crucial information.
The intelligence agency operated covertly to gather information on the enemy.
A cabal of wealthy donors appeared to be covertly influencing legislation through large campaign contributions.
