brio

bree-oh, noun

1. enthusiastic vigor; vivacity; liveliness; spirit

Quote:
"Though my judgement was no doubt affected by all the wine we'd consumed, I remember being elated by our performance that night: our inspired spur-of-the-moment dialogue, the actors fleshing out their roles with such brio."
- Gail Godwin

Origin:
Brio is Italian, from Spanish brio or Provencal brio, both of Celtic origin

fain

feyn, adverb

1.  Content; willing
2.  Gladly

Quote:
"I saw Mark Antony offer him a crown; - yet 'twas not a crown neither, 'twas one of these cononets; - and, as I told you, he put it by once: but, for allt hat, to my thinking, he would fain have had it."
-William Shakespeare, Julius Caesar

Origin:
Fain has ancient roots in the old english faeg, "happy."