ungraspable
adjective
un·grasp·able
| \ ˌən-ˈgra-spə-bəl
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Definition of ungraspable
: not able to be grasped : not graspable
especially
: not easily understood or imagined
That tree had witnessed the assaults of men in mail—how remote such a time seems, and how ungraspable is the fact that real men ever did fight in real armor! … — Mark Twain … students … sometimes recoil in stupefaction and dismay at their ungraspable complexity. — William Plowden