Word of the Day - nonplussed

nonplussed

/nɒnˈplʌst/
adjective
1 So surprised and confused that one is unsure how to react.
2 North American informal Not disconcerted; unperturbed.

Usage
In standard use nonplussed means ‘surprised and confused’, as in she was
nonplussed at his eagerness to help out. In North American English a new
use has developed in recent years, meaning ‘unperturbed’—more or less
the opposite of its traditional meaning—as in he was clearly trying to
appear nonplussed. This new use probably arose on the assumption that
non- was the normal negative prefix and must therefore have a negative
meaning. It is not considered part of standard English.

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I was dismayed, though not nonplussed to read that the US has a backward usage of this word.
I would raise an objection. I would like to raze the misuse. It won't happen. Language marches on!
Adding my own negativity to a double negative undoubtedly negates my influence.