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keen

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1keen/ˈkiːn/adjective
keenerkeenest
1keen
/ˈkiːn/
adjective
keenerkeenest
Learner's definition of KEEN  
[also more keen; most keen]
: 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
   b  : 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
British, of a price  : very low

(as) keen as mustard

British
: very excited and interested : very enthusiastic

keen on

: very excited about and interested in (something)
chiefly British  : interested in or attracted to (someone)

— keenly

adverb

— keenness

/ˈkiːnnəs/noun
[noncount]
2keen/ˈkiːn/verb
keenskeenedkeening
2keen
/ˈkiːn/
verb
keenskeenedkeening
Learner's definition of KEEN  
[no object]old-fashioned + literary
: to make a loud and long cry of sorrow
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