nonplussed vs nonplused

nonplussed and nonplused both are adjectives.

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

As adjectives, nonplussed and nonplused are synonyms defined as:

Other synonyms of nonplussed include at a loss, puzzled.

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