...A fine, imperceptible rain fell in the dark, and great drops gathered on his hair and clothes... 
(AKA Ralph Iron) Olive Schreiner 「The Story of an African Farm」
... Now, this imperceptible usurpation of property by the commonalty was inspired by religion...
P. J. Proudhon 「What is Property?」
...At thisperiod the creatures are very small, and the process of insinuationis painless and imperceptible...
J. Emerson Tennent 「Sketches of the Natural History of Ceylon」
...A slightdifference in size is quite imperceptible when the birds are flying about;while in language and plumage the keenest ornithologist would not beable to detect a difference...
P. L. Sclater 「Argentine Ornithology, Volume I (of 2)」
...Hershrinking was imperceptible, even to a lover's solicitous eye...
Albert Payson Terhune 「His Dog」
...For minutestogether he stood perfectly still, and his movements, as a rule, wereeither so slow as to be all but imperceptible, or so rapid as almost toelude the eye...
Bradford Torrey 「The Foot-path Way」
...The spots on the upper side in the male are sometimes quite imperceptible...
W. S. Coleman 「British Butterfiles」
..." Their flight is easy and apparently performed withouteffort and with an almost imperceptible movement of wing...
Various 「Natural History in Anecdote」
...Keeping time to the music, they approach each otherwith almost imperceptible movements of feet and toes, and a bending at the knees, meanwhile changing the position of the cloths...
Fay-Cooper Cole 「Traditions of the Tinguian: A Study in Philippine Folk-Lore」
...However, the fore end is alittle rounder, and contains a small, almost imperceptible bulbous swelling ofthe canal...
Ernst Haeckel 「The Evolution of Man」
...With the aid of an opera glass thousands ofstars can be seen that are imperceptible to ordinary vision...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...So the perturbing power ofsuch a mass on distant bodies is imperceptible...
Oliver Lodge 「Pioneers of Science」
ランダム例文：
lamentable machinegun presumptions
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