unheard-of
🇺🇸
/ʌnˈhɜːrd əv/
🇬🇧
/ʌnˈhɜːd əv/
adjective
R
Something that has never been known or done before; extremely rare or unusual.
It was unheard-of for a person to travel to the moon, but now it's a reality.
사람이 달을 여행하는 것은 듣보잡이었지만, 이제는 현실입니다.
translation
처음 듣는다