The term 'unfailing' is an adjective that describes something that is reliable and DEPENDABLE. It can be used to describe people, objects, or processes that are CONSISTENT and ACCURATE. The crossword solutions for the term 'unfailing' include 'INVARIABLE' (10 letters), 'TRUE' (4 letters), 'INFALLIBLE' (10 letters), 'INEXHAUSTIBLE' (13 letters), 'DEPENDABLE' (10 letters), 'FAITHFUL' (8 letters), 'ASSIDUOUS' (9 letters), 'DILIGENT' (8 letters), 'UNTIRING' (8 letters), 'CONSTANT' (8 letters), 'CONSISTENT' (10 letters), 'ACCURATE' (8 letters), 'CONTINUAL' (9 letters), 'TRUSTWORTHY' (11 letters), 'UNFALTERING' (11 letters), 'SURE' (4 letters), 'CERTAIN' (7 letters), 'TRUSTY' (6 letters), 'UNERRING' (8 letters), and 'FOOLPROOF' (9 letters). All of these words describe something that is reliable and DEPENDABLE, and can be used to describe a person, object, or process that is CONSISTENT and ACCURATE.