Definition of taciturn adjective from the Oxford Advanced Learner's Dictionary

 

taciturn

 adjective
adjective
BrE BrE//ˈtæsɪtɜːn//
 
; NAmE NAmE//ˈtæsɪtɜːrn//
 
 
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(formal) tending not to say very much, in a way that seems unfriendly a taciturn and serious young man Word Origin late 18th cent.: from Latin taciturnus, from tacitus, past participle of tacere ‘be silent’.
See the Oxford Advanced American Dictionary entry: taciturn