1. 形容詞
   無聊的, 枯燥乏味的
   無趣的
   單調的, 令人生厭的
   不鮮明的, 不明顯的
   隱約的, 模糊的
   暗淡的, 陰沉的
   昏暗的
   笨的, 愚笨的
   愚鈍的
   遲鈍的, 不敏感的
   

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   同義字詞
   blunt,blunted,dulled,obtuse
   arid,boring,colorless,drab,dreary,drudging,dry,dusty,flat,heavy,ho-hum,humdrum,jading,jejune,leaden,mind-numbing,monochromatic,monotonous,numbing,old,pedestrian,ponderous,slow,stale,stodgy,stuffy,stupid,tame,tedious,tiresome,tiring,uninteresting,wearisome,weary,wearying
   beclouded,clouded,cloudy,hazed,hazy,heavy,lowering,louring,overcast,overclouded
   dim,dulled,flat,lusterless,matte,mat
   dulled,faded,light,pale,pastel,washed-out,washy
   brain-dead,brainless,dense,doltish,dopey,dopy,dorky,dumb,fatuous,half-witted,mindless,oafish,obtuse,opaque,pinheaded,senseless,simple,slow,stupid,thick,thickheaded,unintelligent,vacuous,weak-minded,witless
   gentle,low,quiet,soft
   inactive,inert,lethargic,quiescent,sleepy,sluggish,torpid
   

2. 動詞
   不及物動詞:
   痛苦等: 減輕, 緩和
   (興趣、興致等)大減
   (刀刃等)變鈍
   (人)變得遲鈍
   (顏色等)變暗淡
   (天氣等)變陰暗
   (聲音等)變得沉悶
   (談話等)變得乏味
   市場等: 蕭條, 呆滯
   

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   同義字詞
   benumb,blunt,cauterize,damp,dampen,deaden,numb
   blanch,bleach,blench,decolorize,fade,pale,wash out,whiten
   

例句

1. It is dull , Dull , DULL!
2. They're meant to be dull .
3. But a little dull in concert.
4. Never a dull moment, for sure!
5. Her eyes were like dull dry rocks.
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