reserved

The Spanish word 'callado' translates to 'reserved' in English. This term is often used to describe an individual who tends to keep to themselves and does not share or express their thoughts or feelings openly. 'Callado' could also refer to someone who is quiet or not speaking. It is important to note the cultural and contextual differences between English and Spanish, as in certain cases the same word might have slightly different implications depending on the context it is used in.