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- While the ear of the former has an external opening, that of the latter is entirely and evenly covered over with a membrane, so as to be quite imperceptible from without.Chapters 73-75 -- Stubb and Flask Kill a Right Whale; The Sperm Whale's Head, The Right Whale's Head (65% in)
- Moreover, while in most other animals that I can now think of, the eyes are so planted as imperceptibly to blend their visual power, so as to produce one picture and not two to the brain; the peculiar position of the whale's eyes, effectually divided as they are by many cubic feet of solid head, which towers between them like a great mountain separating two lakes in valleys; this, of course, must wholly separate the impressions which each independent organ imparts.Chapters 73-75 -- Stubb and Flask Kill a Right Whale; The Sperm Whale's Head, The Right Whale's Head (52% in)
There are no more uses of "imperceptible" in Moby Dick.
Typical Usage (best examples)