noun

intense and passionate feeling.

he talked with all the fervour of a new convert

passion,ardour,intensity,zeal,vehemence,vehemency,emotion,warmth,sincerity,earnestness,avidness,avidity,eagerness,keenness,enthusiasm,excitement,animation,vigour,energy,fire,fieriness,heat,spirit,zest,appetite,hunger,urgency,dedication,devoutness,assiduity,commitment,committedness,fervency,ardency,passionateness