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English to English adjective
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impossible or difficult to perceive by the mind or senses |  | Example: an imperceptible drop in temperature an imperceptible nod color is unperceivable to the touch
source: wordnet30
| 2 |
Not perceptible; not to be apprehended or cognized by the senses; not discernible by the mind; not easily apprehended. |  | source: webster1913
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