According to the narrator, what is the personality of the wallpaper ?

According to the narrator, the wallpaper is dull, irritating, suicidal, and confusing. 

It is dull enough to confuse the eye in following, pronounced enough to constantly irritate and provoke study, and when you follow the lame uncertain curves for a little distance they suddenly commit suicide—plunge off at outrageous angles, destroy themselves in unheard of contradictions.