nonplussern.
/nɒnˈplʌsə/, U.S. /ˌnɑnˈpləsər/ rare.
A matter which nonplusses a person.
ΘΚΠ
the mind > mental capacity > belief > uncertainty, doubt, hesitation > perplexity, bewilderment > act of perplexing > [noun] > source of confusion
apposalc1470
graveller1674
poser1793
twister1835
nonplusser1845
smog1954
mind-boggler1969
confusable1979
1845 C. Darwin Corr. (1987) III. 177 The means of distribution in some cases, is indeed a non-plusser.
1985 R. Barnard Disposal of Living viii. 88 She subsided into silence. Death is a great nonplusser.
This is a new entry (OED Third Edition, December 2003; most recently modified version published online March 2022).
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n.1845- upon one's way
- upon one's word
- upon or on a stretch
- upon or on suspicion
- upon or on suspicion by suspicion
- upon pain of
- upon pain of life
- upon paper
- upon parole
- upon party
- upon penalty of
- upon point to
- upon profit
- upon purpose
- upon reason
- upon reckoning
- upon record
- upon recovery
- upon reflection
- upon rep
- upon request
- upon rice
- upon right
- upon river
- upon room