The quality of being disagreeable; something that is unpleasant, objectionable, or causing discomfort.
From disagreeable + -ness (suffix forming nouns from adjectives). An older form than disagreeability, appearing in English from the 16th century onward.
While disagreeability is the psychologist's version, disagreeableness is the everyday word—Shakespeare used it to describe everything from bad smells to difficult personalities, showing how adaptable this suffix is.
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