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keen

1 keen /ˈkiːn/ adjective
keener; keenest
1 keen
/ˈkiːn/
adjective
keener; keenest
Britannica Dictionary 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
: 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
2 keen /ˈkiːn/ verb
keens; keened; keening
2 keen
/ˈkiːn/
verb
keens; keened; keening
Britannica Dictionary definition of KEEN
[no object] old-fashioned + literary
: to make a loud and long cry of sorrow