1.unequivocally ad.不含糊地(unambiguously)；明确地(clearly)
例:Microwave irradiations were considered unequivocally to produce “thermal effects”.
2.uneven a.不规则的(not uniform)；不平坦的(rough);不均匀的(unequal)
词根记忆：un（表否定）+even(平的，一致的)--不一致的--不规则的
例：An ancient surface usually has uneven weathering.
派生词：unevenly( ad.不均衡地)
3.unfavorable a．不宜的：令人不快的(not pleasing)；不顺利的(not propitious)
词根记忆：un(不)+favorable(良好的，讨人喜欢的)--令人不快的
例：In only one of these last eleven years was the weather unfavorable for growing citrus crops.
派生词：unfavorably( ad.不利地：不适宜地)
同根词：favorite(a．最喜爱的)
4.unification n．统一；联合(the act, process, or result of unifying)
词根记忆：来自unify(v.统一，使成一体)
例：national unification民族统一 // economic unification经济联合
5.uniform n．制服(the dress of a distinctive design or fashion worn by members of a particular group and serving as a means of identification);a.统一的( consonant)；相同的(same)
词根记忆：uni（单一）+form(形式)--形式单一--统一的
例：Some schools require all of its students to wear uniforms while at school.// Do you think all unprocessed cacao beans contain a uniform amount of caffeine?
派生词：uniformity(n.同样，一致)；uniformly( ad.一律地)
6.unilateral a．单侧的；单方面的(one sided; affecting only one side)
词根记忆：unr（单）+later(边)+al--单边的--单侧的
例：It becomes more difficult for Congress to exercise unilateral authority over Native American affairs.
派生词：unilaterally( ad.单方面地)
同根词：bilateral(a.双边的)
7.uninitiated a．外行的，缺乏丰富知识的(inexperienced)
联想记忆：un(表否定)+initiate(传授)+d--不能传授知识的--缺乏丰富知识的
例：the uninitiated reader缺乏相应知识的读者
8.unionist n．工会会员：联合主义者(an advocate or supporter of union or unionism)
词根记忆：来自union(n.联盟，协会)
例：It was not shared by most unionists until 1935.
同根词：unionism(n．工会主义：联合主义)
9.unionization n．联合，组织工会(the action of organizing a labor union)
例：Politicians and administrators sometimes oppose unionization of clerical workers(行政人员)．