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insignificant, undetectable, not able to be noticed quotations examples
...genius marks its tract, not by the observation of quantities inappreciable to any but the acutest senses, but by placing Nature in such circumstances, that she is forced to record her minutest variations on so magnified a scale, that an observer, possessing ordinary faculties, shall find them legibly written.
1830, Charles Babbage, Decline of Science in England