neshvatljiv

1. (of words, a text) incomprehensible; unfathomable
   Uputstvo je napisano potpuno neshvatljivim jezikom. — The instructions are written in completely incomprehensible language.
2. (of an action, situation) inconceivable; unbelievable
   Neshvatljivo je da niko nije pozvao hitnu pomoć. — It's unbelievable that nobody called an ambulance.
   Njegovo ponašanje mi je neshvatljivo. — His behavior is inconceivable to me.