nonplussed

Meaning

Adj

1. Unsure how to act or respond; bewildered, perplexed.
2. (US, informal, nonstandard) Unaffected, unfazed; unimpressed.

Verb

simple past and past participle of nonplus

nonplus

• Verb
• Noun

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Opposite of

plussed

Synonyms

bewildered

puzzled

confounded

😖

confused

😕

perplexed

at a loss

mystified

nonplused

lost

confoundedly

dazzled

difficult

disconcerted

disoriented

distracted

dumbfounded

embarrassed

fazed

flabbergasted

flustered

hard

mixed-up

muddleheaded

puzzling

stirred

stumped

stupefied

taken aback

thwarted

astonied

be puzzled

flummoxed

at one’s wits end

aback

amated

astonished

😲

at fault

at sea

baffled

baffling

befogged

befuddled

bemused

Translations

perplejo

desconcertado

déconcerté

stupéfait

perplexo

verbluft

verdutzt

verblüffte

irritiert

confondu

détaché

perplexe

se taire

unbeeindruckt

verblüfft

Pronounced as (IPA)

/nɒnˈplʌst/

Etymology

From nonplus (“state of bewilderment or perplexity”, noun) or nonplus (“to bewilder or perplex (someone)”, verb) + -ed (suffix forming adjectives, and the past tense and past participle forms of verbs). Nonplus (noun) is derived from Latin nōn plūs (“no further, no more”), from nōn (“not”) + plūs (“additionally, more; further”) (ultimately from Proto-Indo-European *pleh₁- (“to fill”)). The etymological sense is similar to being left speechless as a result of confusion: the nonplussed person can say or do “no more”.
Sense 2 (“unaffected”) is probably from a misinterpretation of the first element of the word as the prefix non- meaning “not”.