But it raises a question. Do words evolve by mistake, or do they evolve because we need to say something and we don't have the right word for it? Unruffled, unaffected, unimpressed - for me all have a sense of ignoring a situation. Nixon was unaffected by student protests. As opposed to "not knowing what to do"
And part of the problem is shades of meaning. Was someone steady in an unexpected situation? Or were they in a quandary and steady. Or were they just steady from stupidity?
And isn't it interesting how words abound for how people react to situations? And do deduce the same meaning as other people? Like the thing about Eskimos have 200 words for snow?
I was unaffected by the gift of an ice cream cone. I was unimpressed by the .. I was unruffled ... I was nonplussed ...
Perhaps to fully consider and understand nonplussed we must know what plussed means. I was affected ... I was impressed ... I was ruffled ... I was plussed?