reticent

adj. /ˈretɪsnt/ C2

不苟言笑的；沉默寡言的

Unwilling to speak about thoughts or feelings.

仙境例句

The reticent Caterpillar said nothing for some minutes and just smoked its hookah.

寡言的毛毛虫好几分钟一句话也不说，只是抽着水烟袋。