unbeknown
🇺🇸
/ˌʌnbɪˈnəʊn/
🇬🇧
/ˌʌnbɪˈnəʊn/
without someone's knowledge or awareness
Unbeknown to him, his friends had planned a trip.
그에게 알리지 않고, 그의 친구들이 여행을 계획했다.