unfailing

1. ADJ If you describe someone's good qualities or behaviour as unfailing, you mean that they never change. 从不改变的[usu ADJ n]

He had the unfailing care and support of Erica, his wife. 他对他妻子，埃丽卡，从不改变的关爱和支持。

2. unfailinglyADV

He was unfailingly polite to customers. 他对顾客永远都彬彬有礼。