Antonyms for the word "un-failingly" include "occasionally," "intermittently," "erratically," "sporadically," and "inconsistently." These words suggest a lack of reliability, consistency, or predictability. When something is described as happening occasionally or sporadically, it implies that it is not reliable or consistent. The term "erratically" suggests a lack of predictability or stability. These antonyms for "un-failingly" indicate that something is not happening in a consistent or dependable manner. We use these antonyms when describing something that is not always successful or reliable. It is essential to consider these antonyms when conveying ideas that involve dependability, consistency, or predictability.