noun
a word that describes a quality or attribute of a person or thing
adjective
not perceptible or barely noticeable
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The changes in the data were so subtle that they were almost imperceptible to the naked eye.
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I couldn't even tell he had cut his hair, it was so imperceptible.
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Her makeup skills are so good that she can create an imperceptible contour.
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The impact of his words was imperceptible at first, but it slowly started to affect everyone around him.