When Was Nonplussed Added to the Dictionary?

The first known use of nonplussed was in 1606.

When did nonplussed become a word?

The first records of nonplussed as an adjective come from around 1600. The word nonplus was originally used as a noun, and it comes from the Latin phrase nōn plūs, literally translating as “not more” and meaning “no further,” referring to a state in which nothing more can be done—a standstill.

What does the expression nonplussed mean?

"Nonplussed" is one of those words that historically doesn't have a particularly complicated meaning, but it's one that people frequently misuse. ... That's probably because a lot of people use this word to mean unfazed or not bothered by something, while others use it to mean unimpressed.