How could that not speak to a million moviegoers? If they embraced Hoffman with ardor, it was in part because he looked so uncool, and so unbeautiful, and because he so obviously hailed from the same tribe as they did, and because there was a kind of beauty, after all, in the flame of feeling that got stoked inside that sweaty heft and pallor.
-- Anthony Lane, "The Master," The New Yorker, Feb. 17, 2014
Although I had a gift for self-pity, I knew her case would then be worse than mine; for it would be worse to see, as she would see, the ardor in his eyes give place to kindliness than never to have ardor there.
-- Rebecca West, The Return of the Soldier, 1918
Ardor comes from the Latin ārd(ēre) meaning "to burn" and the suffix -or, which often occurs in loanwords from Latin and denotes a condition or property of things. In Middle English, this word was often spelled ardure.