1. 无字的：unleavened 未受激发的 | unlettered 无字的 | unlicensed 无执照的

2. 无教育的/无学问的/文盲的：unless /要是不/如果不/除非/ | unlettered /无教育的/无学问的/文盲的/ | unlicensed /没有执照的/未经当局许可的/

3. 文盲的：tugboat: 拖船 | unlettered: 文盲的 | unruly: presumptuous难驾驭的,蛮横的

adj

1. uneducated in general
    lacking knowledge or sophistication

    e.g. an ignorant man
           nescient of contemporary literature
           an unlearned group incapable of understanding complex issues
           exhibiting contempt for his unlettered companions

    Synonym: ignorantnescientunlearned

2. having little acquaintance with writing

    e.g. special tutorials to assist the unlettered sector of society

    Synonym: analphabetic