shū​dāi​zi

bookworm

书呆子 (書呆子) shū​dāi​zi
bookworm noun
a person who is exceptionally devoted to reading and study

He has been a bookworm since childhood, hiding in his room all day reading.

pedant noun
a person who relies solely on book knowledge and lacks practical wisdom or common sense

That nerd doesn't understand the complexity of real society at all.

Frequency

Movie subtitles
5.34 per million appears in 2% of films
Written text
0.718 per million

Sources

Definitions
CC-CEDICT