聽不見似地,不可聞地
Inaudible \In*au"di*ble\, a. [L. inaudibilis; pref. in- not + audire to hear: cf. F. unaudible. See {In-} not, and {Audible}.] Not audible; incapable of being heard; silent. -- {In*au"di*ble*ness}, n. -- {In*au"di*bly}, adv.
inaudibly adv : in an inaudible manner; "she spoke inaudibly low" [ant: {audibly}]