Jonathan Majors is looking unbothered after his career was totally turned on its head ... grabbing coffee solo after his guilty verdict and Marvel ouster.

The actor was spotted Tuesday in New York City for the first time since being found guilty in his criminal trial and subsequently dropped by Disney.

Jonathan's seemingly unfazed, at least based on the photos, and it's notable he's by his lonesome ... with no Meagan Good in sight after being by his side throughout his NYC assault trial.

As we reported ... Jonathan was found guilty on 2 of 4 counts after being accused of roughing up his ex-girlfriend, Grace Jabbari.

In all, the actor was convicted of charges of reckless assault and harassment ... and was acquitted of aggravated harassment and intentional assault.

As for his former gf, Grace Jabbari, whose allegations went to trial, she finally broke her silence ... posting on social media about a non-profit for domestic violence victims.

Grace says she leaned on Sanctuary For Families a lot this year -- the incident with Majors went down in March -- and is asking folks to donate to the cause.

While Jonathan's attorney is signaling an appeal ... Marvel/Disney quickly distanced themselves, booting him from his key role as Marvel's big villain, Kang the Conqueror.