The noun enthusiastic is enthusiasm.

enthusiasm

Pronunciation: English [?n?θju?zi?z?m], American [?n?θu?zi?z?m].

Definition: n.? Enthusiasm, zeal, enthusiasm.

Plural: enthusiasms.

Etymology: Entered English around 1600, directly derived from modern Latin enthusiasmus, meaning positivity.

Vocabulary collocations:

have enthusiasm.

Full of enthusiasm. Full of enthusiasm.

enthusiasm in the audience Enthusiasm in the audience.

Synonyms

eagerness

Pronunciation: English ['i?g?n?s], American ['i?ɡ?rn?s].

Definition: n. Desire; enthusiasm.

Example: She shows great eagerness for success.

She shows great eagerness for success.

Word collocations:

with eagerness impatiently; eagerly.

Eagerness to learn; eager to learn; enthusiastic about work.

The effect of eagerness is the expectation effect.