tac·i·turn
adjective/ˈtæsɪtɜːn/
/ˈtæsɪtɜːrn/
(formal)- tending not to say very much, in a way that seems unfriendly
不苟言笑的；沉默寡言的；缄默不语的 - a taciturn and serious young man
一个沉默寡言而严肃的年轻人
Word Originlate 18th cent.: from Latin taciturnus, from tacitus, past participle of tacere ‘be silent’. - a taciturn and serious young man