eager
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e.g. eager to get started
e.g. avid for new thrills
KEEN suggests intensity of interest and quick responsiveness in action.
e.g. keen on the latest fashions
ANXIOUS emphasizes fear of frustration or failure or disappointment.
e.g. anxious not to make a social blunder
ATHIRST stresses yearning but not necessarily readiness for action.
e.g. athirst for adventure
e.g. Eager travelers waited for their train.
ANXIOUS is used when there is fear of failure or disappointment.
e.g. I was anxious to learn who won.
KEEN is used when there is great interest and readiness to act.
e.g. The new scouts are keen to learn.
adjective
〖be eager to do〗 〈人が〉しきりに…したがっている
e.g. the man was eager to please
〖be eager for A〗 A〈物･事〉を熱望して［しきりに求めて］いる
e.g. young intellectuals eager for knowledge.
〈人･表情･行為などが〉熱意のある, 熱心な; 〈欲望などが〉激しい(→ ardent); 〖be ～ in A〗 Aに熱心である (!Aは〖動名〗〖名詞〗)
e.g. small eager faces looked up and listened.
USAGE
See usage at anxious.
>Anxious and eager both mean ‘looking forward to something,’ but they have different connotations. Eager suggests enthusiasm about something, a positive outlook: I'm eager to get started on my vacation. Anxious implies worry about something: I'm anxious to get started before it rains.
ORIGIN
Middle English (also in the sense ‘pungent, sour’): from Old French aigre ‘keen’, from Latin acer, acr- ‘sharp, pungent’.