The quality or state of being dependable; the characteristic of being reliable and trustworthy.
From dependable (depend + -able) combined with -ness (Old English -nes, forming abstract nouns from adjectives). This creates a synonym for dependability using a different suffix route through Germanic rather than Latinate word formation.
English has multiple ways to express the same idea—'dependability' and 'dependableness' both mean reliability, but dependability comes from Latin roots while dependableness uses Germanic roots, showing how English borrowed from both language families after the Norman Conquest.
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