Impalpable vs. Imperceptible

Impalpable and Imperceptible Definitions
Impalpable
Not perceptible to the touch; intangible.
Imperceptible
Impossible or difficult to perceive by the mind or senses
An imperceptible drop in temperature.
Impalpable
Difficult to perceive or grasp by the mind.
Imperceptible
So subtle, slight, or gradual as to be barely perceptible
An imperceptible nod.
Impalpable
Not able to be perceived by the senses (especially by touch); intangible or insubstantial; not easily grasped or understood.
Imperceptible
Not perceptible, not detectable, too small in magnitude to be observed
We all missed the imperceptible shake of his head as he tried to warn us without being seen.
ADVERTISEMENT
Impalpable
Not palpable; that cannot be felt; extremely fine, so that no grit can be perceived by touch.
Imperceptible
Beyond the purview of man; too great and all-encompassing to be perceived.
Impalpable
Not material; intangible; incorporeal.
Imperceptible
Not perceptible; not to be apprehended or cognized by the senses; not discernible by the mind; not easily apprehended.
Almost imperceptible to the touch.
Its operation is slow, and in some cases almost imperceptible.
Their . . . subtilty and imperceptibleness.
Impalpable
Not apprehensible, or readily apprehensible, by the mind; unreal; as, impalpable distinctions.
Imperceptible
Impossible or difficult to perceive by the mind or senses;
An imperceptible drop in temperature
An imperceptible nod
Color is unperceivable to the touch
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Impalpable
Incapable of being perceived by the senses especially the sense of touch;
The intangible constituent of energy
Impalpable
Imperceptible to the senses or the mind;
An impalpable cloud
Impalpable shadows
Impalpable distinctions
As impalpable as a dream
Impalpable
Not perceptible to the touch;
An impalpable pulse