[记]词根记忆：lucr(看作lucre钱财)+ative→赚钱的

　　[例]Burdened by debt, Lydgate abandons his dreams of reforming medicine to take a conventional but lucrative practice in London.

　　[同]advantageous, gainful, profitable, remunerative

　　ludicrous adj. 荒唐可笑的(so foolish as to cause disrespectful laughter)

　　[记]词根记忆：lud(玩)+icrous→闹着玩的→可笑的

　　[例]Although his attempts to appear psychotic were so clumsy as to be almost ludicrous , there is evidence that Ezra Pound was able to avoid standing trial for treason merely by faking symptoms of mental illness.

　　[同]laughable, comic, comical, droll, farcical

　　lugubrious adj. 悲哀的(mournful);忧郁的(dismal)

　　[例]Much of the clown’s success may be attributed to the contrast between the lugubrious manner he adopts and the general hilarity that characterizes the circus.

　　[同]melancholy, dolesome, dolorous, lamentable, plaintive

　　luminous adj. 发光的(emitting or reflecting usually steady, suffused, or glowing light);发亮的(of or relating to light or to luminous flux);光线亮的(bathed in or exposed to steady light);明白易懂的(clear, enlightening);有光泽的(shining, illustrious)

　　[记]词根记忆：lumin(光)+ous→发光的

　　[例]Although supernovas are among the most luminous of cosmic events, these stellar explosions are often hard to detect, either because they are enormously far away or because they are dimmed by intervening dust and gas clouds.

　　macabre adj. 骇人的，可怕的(grim and horrible;gruesome)

　　[记]来自法语，原指“骷髅舞蹈”

　　magisterial adj. 有权威的(authoritative;official);威风的

　　[记]词根记忆：magister(=master主人)+ial→主人的→有权威的

　　[例]Something in Christopher responded to the older man’s air of authority; he looked magisterial, used to command.

　　magnanimous adj. 宽宏大量的，慷慨的(noble in mind;high souled)

　　magniloquence n. 夸夸其谈，虚夸(the quality or state of being magniloquent)

　　malicious adj. 恶意的，怨毒的(spiteful;intentionally mischievous or harmful)

　　[记]来自malice(n. 恶意)+ious→恶意的

　　[例]No computer system is immune to a virus, a particularly malicious program that is designed to infect and electronically damage the disks on which data are stored.

　　malign v. 诽谤，中伤(to defame;slander;traduce);adj. 邪恶的(evil;baleful;sinister)

　　[记]词根记忆：mal(坏)+ign→坏的，邪恶的

　　[同]malicious, despiteful, malevolent, rancorous, spiteful

　　malignant adj. 恶毒的，充满恨意的(very malevolent or malicious)

　　[例]The surgeons were worried about the possibility of finding a malignant growth in the patient.

　　[同]despiteful, hateful, malign, rancorous

　　malleable adj. 可塑的，易改变的(capable of being changed;adaptable)

　　[记]词根记忆：malle(=mallet锤子)+able→可锤打的，易变的

　　[例]When clay dries out, it loses its plasticity and becomes less malleable.

　　[同]plastic, ductile, moldable, pliable, supple

　　mandatory adj. 命令的，强制的(authoritatively commanded;obligatory)