adjective Date: 14th century not failing or liable to fail:, constant , unflagging , everlasting , inexhaustible , infallible , sure , ~ly adverb
UNFAILING
Meaning of UNFAILING in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012