loyal

An loyal person or thing sticks with someone or something through good and bad times.

When we talk about loyalty, it's often in the context of relationships. For example, if your best friend is always there for you when things go wrong, they're being very loyal. A partner who sticks by their loved one even when the going gets tough is also showing loyalty. On the other hand, a company that stays true to its mission and values over time can be seen as loyal to its customers. In general, loyalty means being reliable and committed to someone or something in a lasting way.