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• a  incapable of being perceived by the senses especially the sense of touch
• a  imperceptible to the senses or the mind
  an impalpable cloud
  impalpable shadows
  impalpable distinctions
  as impalpable as a dream
• s  not perceptible to the touch
  an impalpable pulse

• Cool may be our country's most precious natural resource: an invisible, impalpable substance that can make a particular brand of an otherwise interchangeable producta sneaker, a .
• Such impalpable stuff is slow to fall.

• intangible

• tangible
• palpable

Quotes

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• John T Noonan in Los Angeles Times
  Each of those consciences, Noonan said, is "more than the voice of your mother, more than an emotional impulse. This mysterious, impalpable, imprescriptible, indestructible and indispensable guide governs our moral life. Each one is different. You...
• Marcel Proust in Broward New Times
  After the people are dead,Proust wrote later, "after the things are broken and scattered...... the smell and taste of things remain poised a long time, like souls...... bearing resiliently, on tiny and almost impalpable drops of their...
• Andy Kerr in Scotsman
  The health minister, Andy Kerr, said: "It's vital we try to detect the disease as quickly as possible, then offer treatment. Two-view mammography is likely to pick up small, impalpable cancers earlier than if only one view is used. Early detection...