dependability

This term describes a state of consistency and trust, whether applied to human character or mechanical performance. It carries a strong positive connotation of stability and the absence of surprise or failure. When applied to people, it suggests a moral or professional virtue of being steadfast. As an abstract quality, this noun is uncountable. It cannot be pluralized to describe multiple instances of reliability; instead, it refers to the general property of being dependable. To quantify it, one must use partitive constructions such as a high degree of dependability or a lack of dependability.