What's the origin of the word "nonplussed"?

Search: non-plussed

Why: Chandler told Maddie she was looking very nonplussed.

Answer: It comes from Latin non plus, "no more, no further," as in "nothing more can be done."

To be nonplussed is to be at a total loss as to what to say or do, "utterly perplexed; completely puzzled."

It doesn't mean "unimpressed" or "indifferent," in case you thought it did:

It does (more or less) mean "fazed" but does not mean "unfazed."

Source: The Mavens' Word of the Day

The More You Know: This creepy thing is called "Nonplussed by Nonuplets," and I officially hate it.

There's a whole gross weird site of these pics called Living in Sim. OK.