Anxious, Ardent, Avid, Concerned, Eager, Exuberant, Fanatical, Forceful, Passionate, Keen, Rabid, Vigorous, Willing, Zealous

Apathetic, Cold, Cool, Disinterested, Dispassionate, Dull, Impotent, Frigid, Lethargic, Unexcited, Uninterested, Uneager, Unenthusiastic