nonplussed — the most vexing word in the English language

Ever since I first encountered it in my teen years, I've dutifully gone and looked it up, then made a serious effort to memorize its meaning so as not to ever have to do so again.

And yet, last night when it appeared in something I was reading, for maybe the fiftieth time in my life I wasn't sure if it meant confused/perplexed — or the opposite.

Here's a dictionary definition of nonplussed: "perplexed; confused; bewildered; disconcerted."

Its origin: "From Latin non plus, no more: non, not; see non + plus, more."

A synonym: "At a loss."

But how do we get from the Latin to the English?

What am I missing?

On second thought, don't answer.

FunFact: As if I'm not already confused enough, it can be spelled either "nonplussed" or "nonplused."

FunFact #2: It's also a noun meaning "A state of perplexity, confusion or bewilderment."

So I guess you'd say "I'm in a nonplus."

You speak for both of us.

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Note added at 4:13 p.m. the same day: On reading the post just now after it appeared on the site, the penny finally dropped.

At long last, a mnemonic tool.

See, the word has always bewildered and confused me — that is, it's nonplussed me.

So nonplus nonplusses me.

So obvious now, like so many things once you figure them out.