Read the dictionary definition of impalpable. All definitions for this word.
1. imperceptible to the senses or the mind
1. an impalpable cloud
2. impalpable shadows
3. impalpable distinctions
4. as impalpable as a dream
2. not perceptible to the touch
1. an impalpable pulse
3. incapable of being perceived by the senses especially the sense of touch
1. the intangible constituent of energy