If you say that someone is being ~ about something, you mean that you think they are deliberately not giving you much information or expressing an opinion about it.
He is ~ about what he was paid for the business.
= guarded
ADJ
CAGEY
Meaning of CAGEY in English
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012