reene a (of the mind, the feelings, the five senses etc. )good, strong, quick at understandings deeply felt, etc. having a strong, active interest: eager . Examples She's keen on football/ passing the examination He and his friend had a keen sense of humor e. He had always kept a keen eye on what was happening around(of the mind, the feelings, the five senses, etc.) good, strong, quick at understanding; deeply felt, etc.; having a strong, active interest; eager keen: adj. Examples • She’s keen on football / passing the examination. • He and his friend had a keen sense of humor. • He had always kept a keen eye on what was happening around