keen on someone or something Definition

keen¹
adj

1. Eager; willing.

Thesaurus: ardent, eager, interested, intent, anxious, assiduous, devoted, diligent, earnest, enthusiastic, fervid, impassioned, industrious, zealous; Antonym: apathetic, lacklustre.
2. Said of competition or rivalry, etc: fierce.
3. Said of the wind: bitter.
4. Said of a blade, etc: sharp.

Thesaurus: sharp, acute, pointed, edged, cutting, piercing, razor like; Antonym: blunt.
5. Said of the mind or senses: quick; acute.

Thesaurus: clever, biting, astute, bright, shrewd, canny, caustic, incisive, perceptive, penetrating, perspicacious, quick, sagacious, sardonic, satirical; Antonym: dull, stupid, slow.
6. Said of prices: low; competitive.

Derivative: keenly
adverb

Derivative: keenness
noun

Idiom: keen on someone or something

Enthusiastic about them or it; fond of them or it.

Etymology: Anglo-Saxon cene bold or fierce.