> I was unaffected by the gift of an ice cream cone. I was unimpressed by the .. I was unruffled ... I was nonplussed ... Exactly, if being unimpressed leads t

> I was unaffected by the gift of an ice cream cone. I was unimpressed by the .. I was unruffled ... I was nonplussed ... Exactly, if being unimpressed leads to you having nothing to say, then being unimpressed leads you to being nonplussed. If you're nonplussed then that might be due to being unimpressed. Thus being nonplussed can become a way of saying that one is unimpressed -- "nonplused" is a more impressive SAT word than "unimpressed" (which isn't an SAT word), so it's rather useful as a way to express just how unimpressed one really is: so unimpressed as to bring out a ten dollar word for expressing the level of unimpressedness.