angustiante

v. distress, worry, sadden, trouble, grieve

adj. distressing, nerve-racking

= nerve-wracking [nerve-racking], anguishing.
Ex: A program should always tell the operator what it is doing once an instruction has been given: there is nothing more nerve-wracking than to enter a command and have the screen go totally blank!.
Ex: Buddhism is above all a form of therapy and that remaining silent in the face of anguished and anguishing questions constitutes a cathartic act.