aporia |əˈpôrēə|
noun
an irresolvable internal contradiction or logical disjunction in a text, argument, or theory : the celebrated aporia whereby a Cretan declares all Cretans to be liars.
Rhetoric the expression of doubt.
ORIGIN mid 16th cent.: via late Latin from Greek, from aporos ‘impassable,’ from a- ‘without’ + poros ‘passage.’