nonplused vs nonplussed

nonplused and nonplussed both are adjectives.

Word	Noun	Adjective	Verb	Adverb
nonplused	No	Yes	No	No
nonplussed	No	Yes	No	No

As adjectives, nonplused and nonplussed are synonyms defined as:

Other synonyms of nonplused include at a loss, puzzled.

nonplused (adjective)	nonplussed (adjective)
filled with bewilderment	filled with bewilderment