ardor

/ˈär-dər/

Middle English ardour, borrowed from Anglo-French ardur, ardour "burning, fever, passion," borrowed from Latin ardōr-, ardor "burning, flash of light, extreme heat, mental excitement, eagerness, passion," from ardēre "to burn, be fiercely hot, be violently excited, be eager" + -ōr-, -or (earlier *-ōs-, *-ōs), abstract noun suffix

noun

  1. an often restless or transitory warmth of feeling

  2. extreme vigor or energy : intensity

  3. zeal

the sudden ardors of youth

the ardor of a true believer

passion fervor ardor enthusiasm zeal mean intense emotion compelling action. passion applies to an emotion that is deeply stirring or ungovernable. fervor implies a warm and steady emotion.