confidant
🇺🇸
/ˈkɑːnfɪdænt/
🇬🇧
/ˈkɒnfɪdænt/
Someone you trust and share your secrets and private thoughts with.
I consider my sister my closest confidant because I can tell her anything.
何でも話せるので、私は私の妹を最も近い信頼できる相手と考えています。