Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.

WORD ORIGIN

late 14c., "never coming to an end, unceasing," from un- (1) "not" + gerundive of fail (v.). Related: Unfailingly.

MORE RELATED WORDS FOR UNFAILINGNESS

Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.