adjective

having or showing intense and eager enjoyment, interest, or approval.

he could be wildly enthusiastic about a project

eager,keen,avid,ardent,fervent,warm,passionate,zealous,lively,vivacious,energetic,energized,animated,vigorous,dynamic,vehement,fiery,excited,exuberant,ebullient,spirited,hearty,wholehearted,committed,willing,ready,devoted,fanatical,earnest,turnt