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.
她向他耳语秘密,但他听不见她,因为她说话的声音太小了。