unfailing
1. [ adjective ] always able to supply more
Examples:

"an unfailing source of good stories" "a subject of unfailing interest"

Related terms: inexhaustible
2. [ adjective ] not liable to failure
Synonyms: foolproof
Examples:

"a foolproof identification system" "the unfailing sign of an amateur" "an unfailing test"

Related terms: infallible
3. [ adjective ] unceasing
Synonyms: unflagging
Examples:

"unfailing loyalty" "unfailing good spirits" "unflagging courtesy"

Related terms: constant
Similar spelling:   unfailingly
  unavailing
  unveiling
  unfaltering
  unfeeling
  unappealing
  unfeelingly
  unblinking
  unhappily
  unbalance
  unveil
  unable
  unifoliate
  unflinching
  unblinkingly
  unbalanced
  unfiled
  unavailable