Search Result for "inaudible": 
Wordnet 3.0

ADJECTIVE (1)

1. impossible to hear; imperceptible by the ear;
- Example: "an inaudible conversation"
[syn: inaudible, unhearable]


The Collaborative International Dictionary of English v.0.48:

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. [1913 Webster]
WordNet (r) 3.0 (2006):

inaudible adj 1: impossible to hear; imperceptible by the ear; "an inaudible conversation" [syn: inaudible, unhearable] [ant: audible, hearable]
Moby Thesaurus II by Grady Ward, 1.0:

21 Moby Thesaurus words for "inaudible": echoless, hush as death, hushed, mousy, noiseless, quiescent, quiet, silent, soundless, still, still as death, stilly, subaudible, unarticulated, unhearable, unpronounced, unsounded, unuttered, unvocalized, unvoiced, whist