nonplus or non-plus (non-PLUHS) - v., to perplex, baffle, or bewilder someone. n., a state of utter bewilderment.
Most often seen as the adjectival participle nonplussed. There is also the (growing) usage of "to render indifferent" or even "bore," as if taking the plus part to mean excitement and this its opposite in the sense of calm, but every dictionary that mentions this cites it as still considered at best nonstandard, and more claim problematic, usage. The plus is actually Latin plūs, more, (so "two plus two" is literally "two [and] two more") and the word as a whole is from Latin, nōn plūs, no further/no more. When you've reached the state of "I can't even" you have been (and are) nonplussed.
---L.
Most often seen as the adjectival participle nonplussed. There is also the (growing) usage of "to render indifferent" or even "bore," as if taking the plus part to mean excitement and this its opposite in the sense of calm, but every dictionary that mentions this cites it as still considered at best nonstandard, and more claim problematic, usage. The plus is actually Latin plūs, more, (so "two plus two" is literally "two [and] two more") and the word as a whole is from Latin, nōn plūs, no further/no more. When you've reached the state of "I can't even" you have been (and are) nonplussed.
---L.