The quality or state of being disciplinable; the degree to which someone can be trained or taught to follow rules.
From disciplinable + -ness (quality or state), stacking three suffixes (discipline + able + ness) to create a noun expressing an abstract quality.
Words like 'disciplinableness' show English's incredible suffix flexibility—you can keep stacking them (discipline-disciplinary-disciplinarian-disciplinarianism) creating progressively more specific meanings!
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