re ‧ served /rɪˈzɜːvd $ -ɜːr-/ BrE AmE adjective
unwilling to express your emotions or talk about your problems ⇨ shy :
Ellen was a shy, reserved girl.
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THESAURUS
▪ bashful shy and not willing to say very much
▪ self-conscious worried and embarrassed about what you look like or what other people think of you
▪ timid not brave or confident
▪ reserved not liking to express your emotions or talk about your problems
▪ introverted thinking a lot about your own interests, problems etc, and not liking to be with other people
▪ withdrawn quiet and not wanting to talk to other people, especially because you are unhappy
▪ antisocial not liking to meet people and talk to them
▪ retiring formal not wanting to be with other people