unobserved
🇺🇸
/ˌʌnəbˈzɜːrvd/
🇬🇧
/ˌʌnəbˈzɜːvd/
not noticed or seen by others
The thief managed to sneak in unobserved during the party.
小偷在派對期間未被發現地溜了進來。