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| jagged | 
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| a.  (鋸齒狀的,不整齊的) unevenly cut; having the texture of something so cut; having a rough quality | 
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| janitor | 
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| n.  (管理員,管門人) door-keeper; porter; one who has the care of public building or suites of rooms | 
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| jeer | 
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| n.  (嘲笑) gear; tackle; combination of tackles, for hoisting or lowering the lower yards of a ship | 
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| jeopardise | 
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| v. Syn. jeopardize (置於危險,威脅) pose a threat to; present a danger to; threaten | 
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| jolt | 
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| n. Syn. bounce; shake (使顛簸,猛擊) sudden jerking, as from a heavy blow; sudden, strong feeling of surprise or disappointment | 
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| judicial | 
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| a.  (法庭的,法官的) pertaining or appropriate to courts of justice, or to a judge; sanctioned or ordered by court | 
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| jumble | 
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| n. Syn. mix (使混亂,混雜) assemble without order or sense; confused multitude of things; chaos; mess; mixture | 
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| junction | 
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| n. Syn. connection; joint; intersection; crossing (連接,匯合處) connection; joint; intersection; crossing | 
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| justification | 
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| n.  (有理,正當,辯護,釋罪) good or just reason; condition or fact of being justified | 
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| juvenile | 
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| n. Syn. youth; young (青少年(的)) youth; adolescent; not fully grown or developed | 
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| keen | 
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| a. Syn. acute; incisive (敏銳的,敏捷的) acute; incisive; sharp ; express grief verbally | 
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| kernel | 
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| n. Syn. nut; core (核心的) central or vital part; most material and central part; grain or seed as of corn | 
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| kindle | 
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| v. Syn. inspire (點燃,照亮,激起) build or fuel a fire; cause to glow; light up; inspire |