ignorant: may imply a general condition: an ~ fool; or it may apply to lack of knowledge or awareness of a particular thing: he's ~ of nuclear physics.


illiterate: applies to either an absolute or a relative inability to read and write: much of that country's population is still ~.


unlettered: implies ignorance of the knowledge gained by being educated or by reading: a literary reference that is meaningless to the ~.


untutored: may imply lack of schooling in the arts and ways of civilization: strange megalithic monuments left by an ~ people.   巨石的


unlearned: suggests ignorance of advanced or scholarly subjects: a poet who speaks to the ~.   （反义词learned学术的，指经过了长期学习研究long study and research，拥有学术知识academic knowledge， 如members of a learned society学术社团成员）    (scholar学者，指精通某知识领域的人persons who have attained mastery of a field of knowledge。如the library attracts thousands of scholars and researchers那个图书馆吸引了成千上万的学者和研究人员)


ignorant无知不知道: 可以泛指缺乏知识；或缺乏特定知识，illiterate文盲: 指不会读写，可以是绝对或相对，unlettered没文化: 指缺乏通过受教育或阅读获取的知识，untutored蒙昧的: 缺乏艺术和文明的教育(文明civilization指有组织有文化的人类社会)，unlearned非学术非专业: 表示缺乏高等学术学科的知识


记忆方法: 1）首字母2I3U我和你<==不无知     “better be unborn than untaught, for ignorance is the root of misfortune”: Plato 与其未受教育，不如未出生，因为无知是不幸的根源: 柏拉图
      
               2）无知的意思是没有知识mean not having knowledge.