The Collaborative International Dictionary
                    Vexatiousness
                    
                        
                
                                                                    Vexatious \Vex*a"tious\, a. [See Vexation.]
Causing vexation; agitating; afflictive; annoying; as, a vexatious controversy; a vexatious neighbor. ``Continual vexatious wars.''
--South.- 
Full or vexation, trouble, or disquiet; disturbed.
He leads a vexatious life.
--Sir K. Digby.Vexatious suit (Law), a suit commenced for the purpose of giving trouble, or without cause. [1913 Webster] -- Vex*a"tious*ly, adv. -- Vex*a"tious*ness, n.
 
Wiktionary
                    vexatiousness
                    
                        
                
                                                                    n. The state of being vexatious.
Usage examples of "vexatiousness".
When I look back to those lonely years, from the perplexities and vexatiousness of the present, it seems to me it was a beautiful and heroic time.