a.

1. 熱心的，熱衷的，深切的[（+on）][+to-v]
   Mrs. Miller is very keen on art.

   米勒太太對藝術很感興趣。

2. 渴望的，極想的[F][（+on）][+to-v]
   She is very keen to visit Canada.

   她渴望訪問加拿大。

3. 敏銳的，敏捷的
   His eyes were still keen.

   他的目光依然敏銳。

4. 鋒利的，銳利的
   He handed me a knife with a keen edge.

   他遞給我一把鋒利的刀。

5. 激烈的；強烈的；尖刻的

n.

1. 慟哭；哀號；輓歌

vi.

1. 慟哭，哀號；唱輓歌
   She keened to herself for a moment.

   她獨自嚶嚶了一陣。

vt.

1. 為……慟哭
2. 用哀號聲發出
   The bereft girl keened her sorrow.

   那個失去親人的姑娘哭出自己的悲痛之情。

adj.

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.

v.

n.