
1) Bearing 2) Comportment 3) Dignified solemnity 4) Dignity 5) High seriousness 6) High-scale seriousness 7) Latin phrase 8) Lordliness 9) Mien 10) Presence 11) Seriousness 12) Solemnity 
Found on 
https://www.crosswordclues.com/clue/gravitas

1) Lordliness 
Found on 
https://www.crosswordclues.com/clue/gravitas

Latin, meaning: weight, seriousness, dignity, importance. 
Found on 
http://archives.nd.edu/ggg.htm

 Gravitas was one of the Roman virtues, along with pietas, dignitas and virtus. It may be translated variously as weight, seriousness and dignity, also importance, and connotes a certain substance or depth of personality. ...
Found on 
http://en.wikipedia.org/wiki/Gravitas

(Latin) 'gravity', a greatly valued Roman characteristic; gravitas meant that one took seriously public and private responsibilities and realized their importance.
Found on 
https://www.encyclo.co.uk/local/10135
 noun formality in bearing and appearance; `he behaved with great dignity`
Found on 
https://www.encyclo.co.uk/local/20974

high seriousness (as in a person's bearing or in the treatment of a subject). Used by Al Gore during the 2000 Presidential election to portray himself as experienced. This unfamiliar word was suddenly being used by numerous members of the media and became ridiculed as orchestrated political spin.
Found on 
https://www.encyclo.co.uk/local/21664

weight, seriousness, dignity, importance.
Found on 
https://www.math.ubc.ca/~cass/frivs/latin/latin-dict-full.html
  No exact match found.