文盲 wénmáng illiterate
How to remember 文盲: 文 culture + 盲 blind = illiterate.
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How it is used
- An illiterate person - 扫除文盲 (sǎochú wénmáng) eliminate illiteracy.
- By extension, someone ignorant in a domain: 电脑文盲 (diànnǎo wénmáng) computer-illiterate. Note it names the person, not the condition.