Ebullient
Ebullient , adjective
[Latin ebulliens, -entis, present participle of ebullire to boil up, bubble up; e out, from + bullire to boil. See 1st Boil.]
Boiling up or over; hence, manifesting exhilaration or excitement, as of feeling; effervescing.
Ebullient with subtlety.
The ebullient enthusiasm of the French.