... His muttering sank into inaudible confusion, till, opening his eyes wide, it struck him that the brown plain he looked at was the old home farm... 
(AKA Ralph Iron) Olive Schreiner 「The Story of an African Farm」
... The boy muttered something inaudible, and half spread over the thing...
(AKA Ralph Iron) Olive Schreiner 「The Story of an African Farm」
...She lowered her head again, murmured an inaudible acknowledgment of Joe’s greeting...
Various 「Ainslee's, Vol. 15, No. 5, June 1905」
...The loudness of the thrushprevented them from giving it any attention, andmade it practically inaudible...
W. H. Hudson 「Birds and Man」
...Tothe keenest human ears the thief's soft progress across the wide livingroom to the wall-safe would have been all but inaudible...
Albert Payson Terhune 「Further Adventures of Lad」
...At a distance of twenty yards his clear sight distinguishes therefuse-tip of a beetle's burrow from a chance lump of earth; his fineear will catch the chirping of a grasshopper inaudible to me...
J. H. Fabre Bernard Miall 「Social Life in the Insect World」
...On windless days I heard singing Seaside Sparrows more than 200 yards away; Sharp-tailed Sparrows were inaudible at distances of more than 40 yards...
Glen E. Woolfenden 「Comparative Breeding Behavior of Ammospiza caudacuta and A. maritima」
...He pursued nothing seriously butout-of-doors, its vaporous atmosphere, its crisp twigs and gracefulbranches, its misty distances and piquant accents, what Thoreau callsits inaudible panting...
W. C. Brownell 「French Art」
...And suddenly there seemed to be a sort of inaudible snap, and one of the magnets hurt the eyes that looked at it, and only the edge of the last of the series was visible...
Various 「Astounding Stories of Super-Science January 1931」
...And Tommy, looking on, and trying tokeep in possession of his faculties, had already come to the conclusionthat the sounds were inaudible to the beetles...
Victor Rousseau 「Astounding Stories of Super-Science January 1930」
...With a screech, which, however, was evidently inaudible to the beetles,Bram leaped at Dodd and seized him by the throat...
Victor Rousseau 「Astounding Stories of Super-Science January 1930」
...We dared to talk in low tones; the rumbling voices and footstepsoutside would make our tiny voices inaudible to Polter...
Various 「Astounding Stories, March, 1931」
...Captain; they're about due now—" Helistened again to some signal inaudible to the others, then hooked uptwo extra head-sets for the officers...
Various 「Astounding Stories of Super-Science, November, 1930」
...They were singing, singing the NationalAnthem, though their voices were inaudible through the turmoil...
Various 「Astounding Stories of Super-Science, October, 1930」
...That terrific holocaust of death and destruction was inaudible...
Various 「Astounding Stories of Super-Science, October, 1930」
...From within itthere came a tiny hum, intermittent, almost inaudible...
Nat Schachner 「Slaves of Mercury」
... inaudible...
Raymond King Cummings 「The White Invaders」
...She shrieked aloud for aid, but her voice was inaudible even to herself...
Marcus Clarke 「For the Term of His Natural Life」
...The opening of his speech was inaudible to Mahony...
Henry Handel Richardson 「Australia Felix」
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causes actualities opposition
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