EAGER, AVID, KEEN, ANXIOUS, ATHIRST mean moved by a strong and urgent desire or interest.

EAGER implies ardor and enthusiasm and sometimes impatience at delay or restraint.

e.g. eager to get started

AVID adds to EAGER the implication of insatiability or greed.

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

having or showing a keen interest in or enthusiasm for something:

〖通例名詞の前で〗熱心な, 熱狂的な〈ファン･読者など〉; 熱烈な〈関心など〉

e.g. an avid reader of science fiction

e.g. she took an avid interest in the project.

(avid for) having an eager desire for:

〖be ～〗 〈人が〉 «…を» 渇望して, 熱心に求めて «for, of»

e.g. she was avid for information about the murder inquiry.

mid 18th century: from French avide or Latin avidus, from avere ‘crave’.