adjective
keener; -est
[also more ~; most ~]
having or showing an ability to think clearly and to understand what is not obvious or simple about something
very strong and sensitive :highly developed
very excited about and interested in something
feeling a strong and impatient desire to do something
strong or intense
informal + old-fashioned :very good :wonderful
This sense is now usually used in a playful or ironic way. - see also peachy keen
literary :having a sharp edge or point
Brit of a price :very low
(as) keen as mustard
Brit :very excited and interested :very enthusiastic
keen on
very excited about and interested in (something)
chiefly Brit :interested in or attracted to (someone)
verb
keens; keened; keening
[no obj] old-fashioned + literary :to make a loud and long cry of sorrow