what's the difference between eager and keen?
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Question

Answer

both are synonyms of each other, although keen can have other meanings:

eager (adj.) - motivated and enthusiastic about something (i.e He is eager to begin his English course.)

keen (adj.) - eager      (i.e He is keen to begin his English course.)
                     to be sharp, intellectually quick      (i.e He has a keen wit.)
                     intense or strong (i.e He has a keen desire to pass his English exam.)

Answer

On this site it is describe what is the difference of this two words :)
http://www.usingenglish.com/forum/ask-teacher/82749-difference-between-keen-eager.html