Antonyms for the word "more confiding" include guarded, distrustful, suspicious, and wary. While being more confiding means being more trusting and open, being guarded implies being cautious and hesitant with sharing information or feelings. Distrustful suggests a complete lack of trust or belief in others, while suspicious involves a feeling of doubt or uncertainty towards others. Lastly, being wary means being cautious and alert, often due to a sense of potential danger or risk. Choosing the appropriate antonym for "more confiding" will depend on the context and tone of the situation.