a. | 1. | Not failing; not liable to fail; inexhaustible; certain; sure. |
Adj. | 1. | unfailing - not liable to failure; "a foolproof identification system"; "the unfailing sign of an amateur"; "an unfailing test" Synonyms: foolproof |
2. | unfailing - always able to supply more; "an unfailing source of good stories"; "a subject of unfailing interest" | |
3. | unfailing - unceasing; "unfailing loyalty"; "unfailing good spirits"; "unflagging courtesy" Synonyms: unflagging |