imperceptible

Part of speech: adverb

imperceptibly.

Part of speech: adjective

That can not be perceived; inappreciable.

Part of speech: noun

Imperceptibleness.

Part of speech: noun

Imperceptibility.

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Usage examples "imperceptible":

  1. " Look at that," he said, with an almost imperceptible movement of his head towards the woman to whom he was presenting his shoulder. - "An Outcast of the Islands", Joseph Conrad.
  2. Sometimes an imperceptible odor will become perceptible in a small inclosure, such as a closed carriage. - "The Turmoil A Novel", Booth Tarkington.
  3. The Indian assented by an almost imperceptible nod. - "The Indian Drum", William MacHarg Edwin Balmer.