Definition of "plussed"

plussed¹

verb
1. simple past and past participle of plus
adjective
not comparable
1. (computing, informal) Containing a plus sign.
  Quotations
  I think the only good form of email address munging is a plussed email address as I have in this message. While I am not automatically bitbucketing email addressed in this way, it does keep it from hitting my inbox and demanding my immediate attention.
  1997, Matthew N. Dodd, “anti-spam e-mail addresses”, in comp.os.vms (Usenet)

plussed²

adjective
not comparable
1. (informal) Calm, collected and unconfused; not nonplussed (“bewildered, unsure how to react”).
  Quotations
  Jady was rarely nonplussed, normally being very plussed indeed, but Alison's ability to move events without really noticing astounded him. She ran her hair idly through her fingers.
  2000, Barry Tighe, Identity Cards, Barry Tighe
  Edgar was a bit not plussed when they asked him about it. Such a problem had never occurred before, he was sure of that, and it would probably have to be […]
  2003, Joy Drinkwater, Kim M. Guzzo, Endings & Beginnings, iUniverse, page 219
  Elhugavamp stopped up her ears with cotton wool and continued to smoke her acrid Serbian cigarillo, looking quite plussed and nonchalant, unlike me, for I was nonplussed and chalant, and innocent of cotton wool ear-stoppers.
  , Gravitas, Punctilio, Rectitude & Pippy Bags, Frank Key, page 313
2. (informal) Bothered, fazed, vexed, or concerned; not nonplussed (“unfazed, unaffected, unimpressed”).
  Quotations
  I have received so much contradictory advice that I am quite plussed [sic] but I am inclined to think that that given to me by Mr. the American Ambassador […]
  1970, Laurence Marton Lerner, The Rise of the Impresario: Bernard Ullman and the Transformation of Musical Culture in Nineteenth Century America
  […] in time for final boarding call, only slightly non-plussed. Actually, I was quite plussed. It's a scary thought to think what might have happened had we missed our plane, the first of 3 connecting flights.
  2009, Valerie Welbourn, Just Say No to Manchanilla Apples!: A Family Travelogue, Lulu.com, page 53
  Both Morty and Bloody Mary feigned being non-plussed by the attention [...and] have to school Even Stephen in keeping things low key. He acted quite plussed by the attention. He bathed in the developing cult status of the Supergroup. “Lay low and play the fucking bass,” Morty repeated throughout their tour.
  2015, Donny Levit, Rock n’ Roll Lies: Ten Stories, AuthorHouse
  "What the hell is that?" I asked, flabbergasted at her nonplussed responses since I was very, very plussed. “Like, a less serious jack...knife...jack...whatever that thing is you keep saying.
  2021, Elizabeth Hayley, Tag, We're It, Waterhouse Press