夏蟲不可語冰 [－虫－－语－]

Jyutping haa6 cung4 bat1 ho2 jyu5 bing1
Pinyin xià chóng bù kě yǔ bīng

Definitions (Wiktionary)
  1. proverb
    Lacking in basic knowledge or experience hinders one's cognition on a certain topic
  2. proverb, derogatory
    Someone is too ignorant to have meaningful discussion