unheard
/ˌʌnˈhɜːd/adjective
1- not heard or listened to不予倾听的; 不予理睬的：
my protests went unheard.
没人理睬我的抗议。
1.1
- of not previously known of or done无人知晓的; 未曾做过的：
sales tax was unheard of in Kansas up until 1937.
1937年以前在堪萨斯州从未听说过营业税
wines from unheard-of villages.
来自无名小村的酒。