adj. 永恒的; 无穷的; 可靠的; 确实的
If you describe someone's good qualities or behaviour as unfailing, you mean that they never change.
He had the unfailing care and support of Erica, his wife...
...a man of unfailing courtesy and kindness...
1. not liable to failure;
2. always able to supply more;
He continued to appear in the office with unfailing regularity thereafter.
Everyone admired her patience and unfailing good humour.
She fought the disease with unfailing good humour .
Their discipline and good behaviour was unfailing.
Dress was the one unfailing talisman and charm used for keeping all things in their places.