imperceptible
CEFR: C2
So slight, gradual, subtle, or minute as to be barely noticeable, detected, or perceived by the senses or instruments.
Synonyms
- undetectable
- inappreciable
- subtle
Common Collocations
- almost imperceptible
- imperceptible change
- imperceptible difference
Example Sentence
Tectonic plate drift occurs at an imperceptible rate of a few centimetres per year.