eager
agog, anxious, ardent, athirst, avid, bright-eyed and bushy-tailed (informal) earnest, enthusiastic, fervent, fervid, greedy, hot, hungry, impatient, intent, keen, keen as mustard, longing, raring, up for it (informal) vehement, yearning, zealous
Antonyms
apathetic, blasé, impassive, indifferent, lazy, nonchalant, opposed, unambitious, unconcerned, unenthusiastic, unimpressed, uninterested