Adjective : intangible arguments.    From Dictionary.com. 

Noun : Intangibles are hard to value.    From Dictionary.com. 

We all may need medicine for moral ills, yet the very intangibleness of purity makes us slow to formulate rules for its growth.    From Wordnik.com.  [Searchlights on Health: Light on Dark Corners A Complete Sexual Science and a Guide to Purity and Physical Manhood, Advice To Maiden, Wife, And Mother, Love, Courtship, And Marriage] Reference

What we make is tangible in a much broader context of intangibleness,'' he explains.    From Wordnik.com.  [Boston.com Top Stories] Reference

And He partly met the difficulty of those who feel its intangibleness by adding the practical clause, “If ye abide in Me and My words abide in you.”.    From Wordnik.com.  [The Greatest Thing in the World And Other Addresses] Reference

3 Communication of Organisation Policies intangibleness after the concept stage while DIRECTION 4 Policy Implementation Resources formulating policies and coverting into figures.    From Wordnik.com.  [Recently Uploaded Slideshows] Reference