impalpableEnglishOxford American Thesaurusimpalpable adjective a glimpse of an idea that remained as impalpable as a dream: intangible, insubstantial, incorporeal, unable to be touched, imperceptible to the touch; indefinable, elusive, hard to define/describe, undescribable; rare immaterial, unbodied, discarnate. ▷antonyms palpable.