Unfailing
ahd-5
adjective.
Always able to supply more; inexhaustible.
adjective.
Constant; unflagging.
adjective.
Incapable of error; infallible.
The Century Dictionary and Cyclopedia
Not liable to fail; incapable of being exhausted: as, an
unfailing
spring;
unfailing
sources of supply.
Not missing; always fulfilling a hope, promise, or want; not coming short; sure; certain.
the GNU version of the Collaborative International Dictionary of English
adjective.
Not failing; not liable to fail; inexhaustible; certain; sure.
Wiktionary, Creative Commons Attribution/Share-Alike License
adjective.
inexhaustible
adjective.
changeless
adjective.
infallible
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adjective.
not liable to failure
adjective.
always able to supply more
adjective.
unceasing