The quality or state of lacking faith, trust, or loyalty; unfaithfulness or disbelief.
From 'faithless' (faith + -less) plus '-ness' suffix (Old English, forming abstract nouns). Double suffix creates abstract noun from adjective.
The '-ness' suffix transforms adjectives into abstract qualities—'faithlessness' turns the behavior or attitude into a measurable character flaw, almost like a disease of the soul.
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