Read the dictionary definition of unfailing. All definitions for this word.
1. unceasing
1. unfailing loyalty
2. unfailing good spirits
3. unflagging courtesy
2. always able to supply more
1. an unfailing source of good stories
2. a subject of unfailing interest
3. not liable to failure
1. a foolproof identification system
2. the unfailing sign of an amateur
3. an unfailing test