ardent

Etymology

First attested circa 14th century as Middle English ardaunt, borrowed from Anglo-Norman ardent and Old French ardant, from Latin ardentem, accusative of ardēns, present participle of ardeō (“I burn”).

adj

1. Full of ardor; expressing passion, spirit, or enthusiasm.
   This ardent exploration, absorbing all his energy and interest, made him forget for the moment the mystery of his heritage and the anomaly that cut him off from all his fellows. 1956, Arthur C. Clarke, The City and the Stars, page 43
   I see by your eagerness and the wonder and hope which your eyes express, my friend, that you expect to be informed of the secret with which I am acquainted; that cannot be; listen patiently until the end of my story, and you will easily perceive why I am reserved upon that subject. I will not lead you on, unguarded and ardent as I then was, to your destruction and infallible misery. 1818, Mary Shelley, chapter 4, in Frankenstein, archived from the original on 2011-10-30
   Nor gushing tears, nor ardent prayers, shall shake our firm decree. 1750, “Theodora”, Thomas Morell (lyrics), George Frideric Handel (music)
2. (literary) Providing light or heat.