"unfailing" in the adjective sense
1. foolproof, unfailing
not liable to failure
"a foolproof identification system"
"the unfailing sign of an amateur"
"an unfailing test"
2. unfailing
always able to supply more
"an unfailing source of good stories"
"a subject of unfailing interest"
3. unfailing, unflagging
unceasing
"unfailing loyalty"
"unfailing good spirits"
"unflagging courtesy"
Source: WordNet® (An amazing lexical database of English)
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