1. 形容詞
   敏銳的, 敏捷的
   鋒利的, 銳利的
   激烈的, 強烈的
   (人)keen on/about ...(人事物):
   對...很感興趣的
   對...熱心的
   對...熱衷的
   (人)keen on/about ...(動詞ing ...):
   對做...很感興趣的
   對做...熱心的
   

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   同義字詞
   acute,delicate,fine,perceptive,quick,sensitive,sharp
   biting,bitter,cutting,penetrating,piercing,raw,sharp,shrewd,smarting,stinging
   cutting,edged,edgy,ground,honed,sharp,sharpened,stropped,trenchant,whetted
   alert,brainy,bright,brilliant,clever,exceptional,fast,hyperintelligent,intelligent,nimble,quick,quick-witted,sharp,sharp-witted,smart,supersmart,ultrasmart
   agog,antsy,anxious,ardent,athirst,avid,crazy,desirous,eager,enthused,enthusiastic,excited,great,greedy,gung ho,hot,hungry,impatient,nuts,pumped,raring,solicitous,thirsty,voracious,wild
   acute,almighty,blistering,deep,dreadful,excruciating,explosive,exquisite,fearful,fearsome,ferocious,fierce,frightful,furious,ghastly,hard,heavy,heavy-duty,intense,intensive,profound,terrible,vehement,vicious,violent
   

2. 動詞
   不及物動詞:
   慟哭, 哀號
   唱挽歌
   及物動詞:
   哀號...(悲哀等)
   /此動詞過去式與過去分詞為"keened"/
   /現在分詞為"keening"/
   /第三者單數現在式為"keens"/
   

   同義字詞
   bay,howl,wail,yowl
   

3. 名詞
   慟哭, 挽歌
   哀號
   /此名詞複數為"keens"/
   

   同義字詞
   groan,howl,lament,lamentation,moan,plaint,wail
   

例句

1. We are all keen on that.
2. I was keen on the brochure.
3. They're not too keen on novelties.
4. This event is run by keen volunteers.
5. Community care, we're very keen on it.
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