noun

intense and eager enjoyment, interest, or approval.

her energy and enthusiasm for life

eagerness,keenness,ardour,fervour,warmth,passion,zeal,zealousness,zest,gusto,brio,pep,go,sap,liveliness,vivacity,vivaciousness,energy,verve,vigour,dynamism,vehemence,fire,excitement,exuberance,ebullience,spirit,avidity,avidness,wholeheartedness,commitment,willingness,readiness,devotion,devotedness,fanaticism,earnestness,oomph,zing,zip,zap,vim,get-up-and-go,fervency,ardency,passionateness