... 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」
...She lowered her head again, murmured an inaudible acknowledgment of Joe’s greeting...
Various 「Ainslee's, Vol. 15, No. 5, June 1905」
...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」
...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」
...That terrific holocaust of death and destruction was inaudible...
Various 「Astounding Stories of Super-Science, October, 1930」
...Itlessened and lessened until it was inaudible...
William Fitzgerald Jenkins 「Invasion」
...From within itthere came a tiny hum, intermittent, almost inaudible...
Nat Schachner 「Slaves of Mercury」
...Images, and sounds, invisible and inaudible were beingreceived from across the millions of miles of space, and they werebeing transmuted within the brains themselves...
Raymond King Cummings 「Wandl the Invader」
... inaudible...
Raymond King Cummings 「The White Invaders」
...A conversation is inaudible in the vicinity of a waterfall...
Carl Vilhelm Ludvig Charlier 「Lectures on Stellar Statistics」
...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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