adj.形容詞無聊The class was so dull that most students chose not to attend
adj.形容詞陰沉的;昏暗的Its quite dull outside
adj.形容詞鈍This knife is so dull it cannot cut paper
v.t.及物動詞弄鈍;使遲鈍Years of use will certainly dull the edge of a knife
adj.形容詞有沒有光澤I could not see my face in the dull window
adj.形容詞愚鈍的;笨的He's dull and stupid, don't bother talking to him
adj.形容詞(色彩等)不鮮明的;晦暗的The photograph was dull, its colors were not clear