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imperceptible

imperceptible, unnoticeable

adjective eem-pehr-sep-TEE-bleh Rare
Descriptions & Qualities Degree

Usage Note

Imperceptible describes something so slight or subtle that it cannot be detected by the senses or mind. It is an invariable adjective — the same form serves both masculine and feminine: cambio imperceptible, diferencia imperceptible. The adverb form is imperceptiblemente. The antonym is perceptible. It is often used in scientific or literary registers to describe extremely small changes.

Examples

"Hubo un cambio imperceptible en su expresión."

Natural Translation

There was an imperceptible change in his expression.

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