1The imperceptible movement of the needle on the scale made it hard to measure the weight accurately.
2Was the change in her expression imperceptible, or did you notice something was wrong?
3The new policy aims to reduce the imperceptible but cumulative impact of microplastics on marine ecosystems.
4Try not to make any sudden movements that might startle the animal, as they can detect even imperceptible changes in their surroundings.
5There is an imperceptible difference in the flavor profiles of the two wines, but connoisseurs claim to be able to tell them apart.