eager/ˈiːɡə(r)/
▶adjective strongly wanting to do or have something. ■ keenly expectant or interested.
– phrases
eager beaver informal an enthusiastic person who works very hard.
– derivatives
eagerly adverb,
eagerness noun.
– origin ME (also in the sense ‘pungent, sour’): from OFr. aigre ‘keen’, from L. acer, acr- ‘sharp, pungent’.