keener

UK:^*^*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈkiːnə/

From keen (adj):

Collins Concise English Dictionary © HarperCollins Publishers::

keener /ˈkiːnə/ n

Canadian informal a person, esp a student, who is keen, enthusiastic, or zealous

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 Termsgreat;
wonderful:a keen new bike.

keen•ly, adv. : felt the loss keenly.
keen•ness, n. [uncountable]]

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 Termsgreat;
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