nonplussed

1. (chiefly US, informal, nonstandard) Unaffected, unfazed; unimpressed.Examples: ""I regard Dean [W. P.] Baddeley's gambling activities with embarrassment and dismay," said Anglican dean of Melbourne S. Barton Babbage. […] The Rev. Baddeley remained nonplussed. "I don't intend to make a habit of going to the races but I feel clergymen should mix as our Lord did with all walks of life," Dr. Baddeley said."; "And while many of us might be a little taken aback if Mom showed up at our offices, Secrist is utterly nonplussed, even happy about it."; "One cannot help but wonder how the unnecessary death of 10 men sat on [John Charles] Fremont's conscience. From all appearances, he seemed nonplussed and never was remorseful or contrite."Synonyms: blasé, jaded, adiaphroistic, apathetic, apathistical, blasé, deaf, coolAntonyms: plussedUSinformalnonstandard