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on
WordReference Random House Learner's Dictionary of American English © 2026 keen1 /kin/USA pronunciation
adj., -er, -est.
finely sharpened; so shaped as to cut or pierce readily:a razor with a keen edge.
sharp, piercing, or biting:a keen wind.
very sensitive, responsive, or alert:a keen sense of hearing; a keen mind.
having great ability to see clearly and understand; astute:a keen observer of human nature.
intense:keen competition for the job.
eager; interested; enthusiastic: [ ~ + to + verb] [ usually: be + ~] I was very keen to go swimming.[ ~ + on/about] He was very keen on football.
interested in romantically:[ be + ~ + on] not keen on anyone special at the moment.
Slang Terms great; wonderful:a keen new bike.
keen•ly , adv. : felt the loss keenly.
keen•ness , n. [ uncountable ] ]
WordReference Random House Unabridged Dictionary of American English © 2026 keen1
(kēn),USA pronunciation adj., -er, -est.
finely sharpened, as an edge; so shaped as to cut or pierce substances readily:a keen razor.
sharp, piercing, or biting:a keen wind; keen satire.
characterized by strength and distinctness of perception; extremely sensitive or responsive:keen eyes; keen ears.
having or showing great mental penetration or acumen:keen reasoning; a keen mind.
animated by or showing strong feeling or desire:keen competition.
intense, as feeling or desire:keen ambition; keen jealousy.
eager; interested; enthusiastic (often fol. by about, on, etc., or an infinitive):She is really keen on going swimming.
Slang Terms great; wonderful; marvelous.
bef. 900; 1930–35 for def. 8; Middle English kene, Old English cēne ; cognate with German kühn, Old High German chuoni bold, Old Norse kœnn wise, skillful
keen′ ly , adv.
keen′ ness , n.
1. 4. See sharp. 2. cutting, bitter, caustic. 3. piercing, penetrating, acute. 4. discerning, acute, astute, sagacious, shrewd, clever. 5. See avid. 7. earnest, fervid.
keen2
(kēn),USA pronunciation n.
a wailing lament for the dead.
v.i.
to wail in lamentation for the dead.
v.t.
to bewail or lament by or with keening.
Irish caoine (noun, nominal), caoin- (verb, verbal, stem of caoinim ) lament 1805–15
keen′ er , n.
Collins Concise English Dictionary © HarperCollins Publishers::
keen /kiːn / adj eager or enthusiastic (postpositive ) followed by on : fond (of); devoted (to) : keen on a girl , keen on golf intellectually acute : a keen wit (of sight, smell, hearing, etc) capable of recognizing fine distinctions having a sharp cutting edge or point extremely cold and penetrating : a keen wind intense or strong : a keen desire chiefly Brit extremely low so as to be competitive : keen prices Etymology: Old English cēne; related to Old High German kuoni brave, Old Norse koenn wise; see can 1 , know ˈkeenly adv ˈkeenness n keen /kiːn / vb (intransitive ) to lament the dead n a dirge or lament for the dead Etymology: 19th Century: from Irish Gaelic caoine, from Old Irish coīnim I wail ˈkeener n
'keen on ' also found in these entries (note: many are not synonyms or translations):