The quality or state of being amiss; wrongness, impropriety, or the condition of something being out of place.
Formed from 'amiss' plus the suffix '-ness' (state or quality), where 'amiss' comes from Old Norse 'á mis.' This construction follows the standard English pattern of adding '-ness' to adjectives to create abstract nouns.
While rarely used today, 'amissness' appears in 16th and 17th-century philosophical texts discussing the nature of disorder—it's one of those elegant abstract nouns that philosophers loved for describing intangible states.
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