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.
avid adds to eager the implication of insatiability or greed.
keen suggests intensity of interest and quick responsiveness in action.
anxious emphasizes fear of frustration or failure or disappointment.
athirst stresses yearning but not necessarily readiness for action.
Middle English, from Old English ofthyrst, past participle of ofthyrstan to suffer from thirst, from of off, from + thyrstan to thirst — more at of
before the 12th century, in the meaning defined at sense 1
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