HSK 7-9
孤陋寡闻
gūlòu-guǎwénignorant and inexperienced; ill-informed and narrow-minded
我过去孤陋寡闻还请多指教。
Wǒ guò qù gū lòu guǎ wén hái qǐng duō zhǐ jiào.
I used to be ill-informed, so I welcome your guidance.
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Appears across levels (7-9) in the HSK 3.0 word list.