Eager

Fits when informal language should convey barely contained readiness

Careful The exuberant idiom belongs in chatty praise and will jar in resumes, formal cards, or measured recommendations.

Fits when strong interest is present but the tone should stay measured

Careful In American writing it can sound less natural, and it does not always imply immediate readiness.

Fits when preparation and immediate availability matter

Careful A person can be prepared without wanting the task, so this omits the positive appetite.

Fits when happy anticipation is more important than willingness to act

Careful Excitement can be passive or short-lived; eager usually points toward participation.

Fits when visible approval and positive energy are the main qualities

Careful Someone may celebrate an idea enthusiastically without being ready to do the work.

Fits when a goal supplies the reason and energy to act

Careful Motivation can be private and disciplined rather than visibly anticipatory.

Fits when consent and openness to help are enough

Careful It may signal mere acceptance rather than the active desire conveyed by eager.

Fits when an established, intense interest in an activity is being described

Careful Use it for a sustained pursuit such as reading or collecting, not one upcoming chance to help.