inaudibly
🇺🇸
/ɪnˈɔːdəbli/
🇬🇧
/ɪnˈɔːdəbli/
so quietly that it cannot be heard
She whispered the secret to him, but he couldn't hear her because she was speaking inaudibly.
她對他耳語秘密,但他聽不見她,因為她說話的聲音太小了。