no，not，nay，nope；

[例句] 奇迹就是看似不可能，却发生了。 A miracle is something that seems impossible but happens anyway.

[例句] 我们活着是为了什么？不就是给邻居当笑柄，再反过来笑他们。 For what do we live, but to make sport for our neighbours, and laugh at them in our turn?

not enough，insufficient，less than，deficiency，fall short of ；

[例句] 有些店我们人手不足，对顾客照顾不周。 In some stores we were undermanned and customer service was suffering.

[例句] 据说为研究和技术方面提供的经费严重不足。 Research and technology are said to be chronically underfunded.

instability，unstabitily，swinging，astable，astaticism ；

[例句] 劳工部的数据进一步印证了经济复苏状况的不稳定。 The Labor Department figures underscore the shaky state of the economic recovery.

[例句] 不稳定局面多半是由战争对经济的影响造成的。 Much of the instability stems from the economic effects of the war.

out-off-balance，imbalance，lack of balance，non-equalizing ；

[例句] 不同地区间的经济不平衡 economic inequalities between different areas

[例句] 中国经济的不统一、不平衡,对于抗日战争反为有利. The heterogeneity and uneven development of China's economy are rather advantageous in the war of resistance.

bad，harmful，undesirable，unhealthy，badness；

[例句] 轻松捞取利润的可能性吸引了一拨不良商人。 The prospect of easy profits has attracted the wrong kind of businessman.

[例句] 对赞助的依赖会给剧团带来不良的影响。 Reliance on sponsorship can have a malign effect on theatre groups.

asymmetric(al)，unsymmetric(al)，dissymmetric(al)，asymmetry，dissymmetry ；

[例句] 大多数人的脸不对称。 Most people's faces are asymmetric.

[例句] 迈洛的八字胡生得就是倒霉相,左右两撇一点儿也不对称. Milo's mustache was unfortunate because the separated halves never matched.

incomplete，imperfect，imperfection，imperfectness，inadequacy ；

[例句] 韦德先生对两个问题给出了不完全肯定的回答。 Mr Wade answers both questions with a qualified yes.

[例句] 斯科特的肌肉萎缩，一条腿发育不完全，成了个瘸子。 Scott's muscle atrophied, his leg became stunted, and he was left lame.

invariant，fixedness，immovability，invariability，steadiness ；

[例句] 我们在威斯敏斯特教堂看到的是一种经年不变的古旧仪式。 What we see at Westminster is a tired old ritual.

[例句] 如果其他条件不变，大多数房客都愿意住单人间而不会选择与他人同住。 Other things being equal, most tenants would prefer single to shared rooms.

nonsequence，discontinuous，discontinuity，discontinuousness，incontinuity ；

[例句] 波既不能有不连续处,又不能有几率为无穷大的区域. The wave has neither discontinuities nor regions of infinite probability.

[例句] 他发现声速面通常是不连续的. He found that the sonic surface was, in general, discontinuous.

[物] opacification，opacitas，opacity，opaque ；

[例句] 如果不想从室内看到街景，可以使用不透明玻璃。 You can always use opaque glass if you need to block a street view.

[例句] 在疾病后期,不透明的角膜可能产生溃疡,甚至穿孔. In advanced stages the opaque corneas may ulcerate and even perforate.

irregular，inordinance，abnormity，anomaly ；

[例句] 在这个形状不规则的湖泊的湖心以外的地方有一眼喷泉。 Located off-center in the irregularly shaped lake was a fountain.

[例句] 不规则动词 a verb with an irregular conjugation

irreversible，nonreciprocal，nonreversible ；

[例句] 这是由于磁畴边界的不可逆运动所致. This results from the irreversible motion of domain boundaries.

[例句] 弹射座椅操纵杆只能用一次, 它的使用将引起重要的变化,而且这个过程是不可逆的. Ejector seat levers can only be used once, and their consequences are significant and irreversible.

difference，distinct，diverse，not the same；

[例句] 他们把她与不同的男人扯上关系，包括大亨唐纳德·特朗普。 They've linked her with various men, including magnate Donald Trump.

[例句] 每块砖在色调、质地与大小上也都略有不同。 Each brick also varies slightly in tone, texture and size.

be unhappy，be displeased，be indisposed，feel under the weather ；

[例句] 露西的冷淡与世故使得巴里十分不快。 Barry had his nose put out of joint by Lucy's aloof sophistication.

[例句] 她皱皱鼻子，为他毫无热情而感到不快。 She wrinkled her nose, piqued by his total lack of enthusiasm.

unqualified，below grade，below proof，off-grade，disqualification ；

[例句] 学校不会接受任何学生质量不合格的作业。 A school would not accept low-quality work from any student.

[例句] 鲍勃体检不合格。 Bob failed his physical.

lawless，illegal，unlawful，illegitimacy，iniquity ；

[例句] 一些不法青年结成一伙,使这个地区陷于恐怖. A number of unruly youths ganged up and terrorized the district.

[例句] 一些不法青年结成一伙,使这个地区充满恐怖. A number of unruly youth ganged up and terrorized the district.

sterility，dysgenesis，infertility ；

[例句] 该病会导致男女不孕不育。 This disease causes sterility in both males and females.

[例句] 这种杀虫剂使得男性工人终生不育. Male workers were made permanently sterile by this pesticide.

irregularly scheduled，non scheduled，aperiodicity，without day ；

[例句] 他不定期地来探访我们. He visits us at irregular intervals.

[例句] 他在不定期航空公司受过训练. He got his training with the non - skeds.

real estate，immovable property，immovables，estate，freehold ；

[例句] 不动产和个人财物保险 insurance of property and personal belongings

[例句] 文森特·弗伦奇在房地产这个艰难行业做了最吃苦受累的不动产经纪人。 Vincent French is a real estate broker at the sharp end of a tough and exacting business.

unreasonable，irrational，illogicality，impertinency，inconsequence ；

[例句] 从所犯罪行来看，这一量刑完全不合理。 This sentence is totally disproportionate to the alleged offence.

[例句] 从教育角度看，全国统考是不合理的。 The national tests were educationally unsound.