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

im·pal′pa·bil′i·ty n.
im·pal′pa·bly adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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Adv.1.impalpably - not substantially; lacking substantial expression or fullness
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
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Generally the atmosphere is hazy; and this is caused by the falling of impalpably fine dust, which was found to have slightly injured the astronomical instruments.
What she can do is tap out, on the bodily semaphore of that superb fifth line's rebel trochees and spondee, a coded if subconsciously inarticulate resistance to the life sentence her culture has pronounced: a condition of make-believe that is neither faith nor poetry but something impalpably in between.
It is therefore fascinating to note that ideology almost impalpably became secondary to culture.