Use nonplussed for real bewilderment, especially when someone is left unsure what to say or do.
Use nonplussed for real bewilderment, especially when someone is left unsure what to say or do.
| Incorrect | Correct |
| She was nonplussed and knew exactly what to say. | She was nonplussed and could not think what to say. |
| The instructions were nonplussed. | The instructions were confusing. |
| He felt nonplus by the news. | He felt nonplussed by the news. |
Use nonplussed as the past form of nonplus when the subject caused confusion or speechlessness.
| Incorrect | Correct |
| The joke nonplussed to the audience. | The joke nonplussed the audience. |
| The delay was nonplussed the manager. | The delay nonplussed the manager. |
| Her answer nonplused the panel. | Her answer nonplussed the panel. |
Use nonplussed in this sense only when the context makes calmness clear, and prefer unfazed when precision matters.
| Incorrect | Correct |
| The formal report said the witness was nonplussed, meaning calm. | The formal report said the witness was unfazed. |
| She was nonplussed and deeply confused by the praise. | She was nonplussed by the praise. |
| Readers everywhere accept nonplussed to mean calm. | Many readers still object when nonplussed means calm. |
Treat the traditional sense as the safest default, and reserve the newer unfazed sense for contexts where it cannot be mistaken.
nonplussed is often assumed to mean calm because of its opening non-, although the older sense is perplexed or at a loss.
From nonplus, a state where nothing more can be said or done, from Latin non plus, "no more" or "no further".
What does nonplussed mean?
Nonplussed traditionally means perplexed, baffled, or unsure how to respond.
Can nonplussed mean unfazed?
Yes, especially in chiefly US use, but many readers still treat that sense as confusing or nonstandard.
What is the safest synonym for nonplussed?
For the traditional sense, perplexed, baffled, or flummoxed is usually safest.
Why is nonplussed confusing?
The first part looks like the negative prefix non-, but the word comes from Latin non plus, meaning no more.
Is nonplussed an adjective or a verb?
It is commonly an adjective, and it can also be the past tense or past participle of the verb nonplus.
What should replace nonplussed when it means calm?
Use unfazed, unimpressed, or unbothered when the calm sense needs to be unmistakable.