Definition of "impalpable" []

• Not perceptible to the touch; intangible. (adjective)
• Difficult to perceive or grasp by the mind. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "If we want endless, satisfying blue, we must look up to where it dwells in impalpable space, shining like solid enamel, or liquid and vague."
• "As for microscopic lesions, once detected in mammograms, a doctor is duty bound to treat them as there is no way of knowing whether these early "impalpable" cancers will be aggressive or harmless."
• "All sorts of higher abstractions bring with them the same kind of impalpable appeal."