Incapable of being apprehended by the mind or the senses

• unobservable

  1. That cannot be observed.
  2. Something that cannot be observed.

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  1. That cannot be observed.
  2. Something that cannot be observed.

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• unnoticeable

  1. Not readily noticeable.

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  1. Not readily noticeable.

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• invisible

  1. Impossible to see; not visible:
  2. Not accessible to view; hidden:
  3. Not easily noticed or detected; inconspicuous:

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  1. Impossible to see; not visible:
  2. Not accessible to view; hidden:
  3. Not easily noticed or detected; inconspicuous:

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• insensible

  1. Imperceptible; inappreciable:
  2. Very small or gradual:
  3. Having lost consciousness, especially temporarily; unconscious:

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  1. Imperceptible; inappreciable:
  2. Very small or gradual:
  3. Having lost consciousness, especially temporarily; unconscious:

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• indistinguishable

  1. Impossible to differentiate or tell apart:
  2. Impossible to discern; imperceptible:
  3. Difficult to understand or make out; vague:

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  1. Impossible to differentiate or tell apart:
  2. Impossible to discern; imperceptible:
  3. Difficult to understand or make out; vague:

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• indiscernible

  1. Difficult or impossible to discern or perceive; imperceptible:

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  1. Difficult or impossible to discern or perceive; imperceptible:

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• inappreciable

  1. Too small to be noticed or make a significant difference; negligible:

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  1. Too small to be noticed or make a significant difference; negligible:

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• imponderable

  1. That cannot undergo precise evaluation:

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  1. That cannot undergo precise evaluation:

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• imperceptible

  1. Impossible or difficult to perceive by the mind or senses:
  2. So subtle, slight, or gradual as to be barely perceptible:

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  1. Impossible or difficult to perceive by the mind or senses:
  2. So subtle, slight, or gradual as to be barely perceptible:

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• impalpable

  1. Not perceptible to the touch; intangible.
  2. Difficult to perceive or grasp by the mind.

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  1. Not perceptible to the touch; intangible.
  2. Difficult to perceive or grasp by the mind.

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Uncertain

• hypothetical

  1. Of, relating to, or based on a hypothesis:
  2. Conditional; contingent:
  3. A hypothetical circumstance, condition, scenario, or situation:

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  1. Of, relating to, or based on a hypothesis:
  2. Conditional; contingent:
  3. A hypothetical circumstance, condition, scenario, or situation:

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• elusive

  1. Tending to elude capture, perception, comprehension, or memory:
  2. Difficult to define or describe:

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  1. Tending to elude capture, perception, comprehension, or memory:
  2. Difficult to define or describe:

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• unsure

  1. Lacking confidence.
  2. Uncertain of the facts.
  3. Precarious; unstable; unreliable.

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  1. Lacking confidence.
  2. Uncertain of the facts.
  3. Precarious; unstable; unreliable.

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• indefinite

  1. Unclear; vague.
  2. Lacking precise limits:
  3. Uncertain; undecided:

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  1. Unclear; vague.
  2. Lacking precise limits:
  3. Uncertain; undecided:

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Ethereal

• ephemeral

  1. Lasting for a markedly brief time:
  2. Having a short lifespan or a short annual period of aboveground growth. Used especially of plants.
  3. Something, especially a plant, that is ephemeral.

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  1. Lasting for a markedly brief time:
  2. Having a short lifespan or a short annual period of aboveground growth. Used especially of plants.
  3. Something, especially a plant, that is ephemeral.

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• airy

  1. Open to or allowing in air; breezy or drafty:
  2. Extensive in area or height; spacious:
  3. High in the air; lofty:

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  1. Open to or allowing in air; breezy or drafty:
  2. Extensive in area or height; spacious:
  3. High in the air; lofty:

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• impalpable

  1. Not perceptible to the touch; intangible.
  2. Difficult to perceive or grasp by the mind.

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  1. Not perceptible to the touch; intangible.
  2. Difficult to perceive or grasp by the mind.

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