nonplussed

American

[non-pluhst] / nɒnˈplʌst /

Sometimes nonplused

adjective

completely puzzled or perplexed by something unexpected.

She blows a hole in the wall and escapes, and the nonplussed aliens are left wondering what happened.
not dismayed; indifferent or unexcited; calm.

I hadn’t yet told my girlfriend I was leaving—I didn't want to risk being crushed by a nonplussed response to the news.

verb

the simple past tense and past participle of nonplus.

Usage

The most common sense of nonplussed is “puzzled or perplexed”: Her odd choice of words left me somewhat nonplussed. But there is a more recent and less common usage with almost the opposite meaning, “unfazed, indifferent, or unexcited”: She remained nonplussed throughout the child’s tantrum, simply waiting till it was over. Although this second usage is gaining traction even in edited writing, many speakers and writers consider it nonstandard and avoid it as potentially confusing. There are several theories about how this contradictory second meaning came into being. One explanation is the analysis of nonplussed as non- “not” + plussed, interpreted as “not puzzled, perplexed, bothered, or impressed,” possibly by analogy with other words that have a negative prefix and similar meaning, such as unfazed and indifferent, and perhaps influenced by nonchalant. However, plussed has no meaning in English, and the non at the beginning is not in fact the common English negative prefix non- found in such words as nonalcoholic or nonexistent. Interestingly, the adjective nonplussed was formed from the less common verb nonplus “to puzzle or perplex,” which was originally a noun meaning “a state of utter perplexity,” and this noun was borrowed from the Latin phrase nōn plūs “not more; no further.” In other words, a state of perplexity is one in which the person can think of no more to say or do.

Etymology

Origin of nonplussed

First recorded in 1600–10; nonplus ( def. ) + -ed ² ( def. )

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

For now, investors appear nonplussed about potential disruptions to regional supply flows.

From Barron's • Feb. 17, 2026

It featured Evan, Anthony and Zachary performing a rendition of Hilary Duff’s “What Dreams Are Made Of” before a crowd of nonplussed seniors, while Darshan danced along next to them on a laptop screen.

From The Wall Street Journal • Jan. 28, 2026

I was nonplussed at a 1992 symposium in Vienna when a hall filled with international art world denizens went absolutely wild, cheering and stomping when Kelley was introduced on a panel.

From Los Angeles Times • Dec. 1, 2025

But Rotem Naftalovich, of Rutgers University in New Jersey, one of the three researchers involved, said the US food regulator was nonplussed by the admittedly "wonky" idea.

From BBC • Sep. 19, 2025

And all of them felt as nonplussed as the man had been when he’d first seen them.

From "The Amber Spyglass" by Philip Pullman

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023