keen

Concise Oxford English Dictionary © 2008 Oxford University Press:
keen1

▶adjective

• 1 chiefly Brit. eager; enthusiastic.

  ■ (keen on) interested in or attracted by.

• 2 (of the edge or point of a blade) sharp.

  ■ (of a sense or mental faculty) acute or quick.

  ■ (of the air or wind) cold and biting.

• 3 (of activity or feeling) intense.

• 4 Brit. (of prices) very low; competitive.

– derivatives
keenly adverb,
keenness noun.

– origin OE cēne ‘wise, brave’, of Gmc origin.

Concise Oxford English Dictionary © 2008 Oxford University Press:
keen2

▶verb wail in grief for a dead person.

■ make an eerie wailing sound.

▶noun an Irish funeral song accompanied with wailing in lamentation for the dead.

– derivatives
keener noun.

– origin C19: from Ir. caoinim ‘I wail’.