avidity
zeal
Zeal
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eager.
The word 'enthusiasm' is an abstract noun; a word for eager enjoyment, interest, or approval; a word for an emotion.
I believe you meant zealous. It is an adjective, and means to be full of zeal. Zeal means to have an eager interest in pursuit of something.
I believe you meant zealous. It is an adjective, and means to be full of zeal. Zeal means to have an eager interest in pursuit of something.
. having or showing keen interest or intense desire or impatient expectancy
avidity
Enthusiastic means to show intense and eager enjoyment. Apathetic basically means the opposite, showing or feeling no interest.
Earnest.
having or showing intense and eager enjoyment, interest, or approval. Basically feeling really happy or excited.