imperceptible
im·per·cep·tible
adjective
1.
impossible or difficult to perceive by the mind or senses
- “an imperceptible drop in temperature”
- “an imperceptible nod”
- “color is unperceivable to the touch”
Origin
Inherited from Middle English imperceptible, from Middle French imperceptible and its etymon Medieval Latin imperceptibilis. By surface analysis, im- + perceptible.
Related words
See also
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.