adjective. ['ɪkˈsɛpʃənəl'] far beyond what is usual in magnitude or degree.
adjective. ['ɪkˈsɛpʃənəl'] surpassing what is common or usual or expected.
adjective. ['ɪkˈsɛpʃənəl'] deviating widely from a norm of physical or mental ability; used especially of children below normal in intelligence.