imperceptible
/ˌɪmpərˈsɛptəbəl/
adjective
- Impossible or extremely difficult to notice or detect using the senses.
- She made an imperceptible nod to signal her agreement.
- The glacier's movement is imperceptible over a single day.
- The difference in temperature was imperceptible to the human hand.
- Very slight or gradual, so as to be barely noticeable.
- Over years, the imperceptible erosion wore down the mountain.
- There was an imperceptible shift in his mood as the conversation went on.
- The imperceptible change in the color of the sky signaled the approaching dawn.
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