An excessive tendency to rely on clichés or conventional wisdom; the practice or ideology of treating ordinary matters as if they were extraordinary.
From 'commonplace' (a thing that is not unusual) + -ism (a suffix denoting a practice, system, or ideology). This rare formation reflects 19th-century philosophical interests in naming widespread intellectual habits.
Commonplaceism is the opposite of original thinking—it's when someone mistakes repetition for truth, like saying 'it is what it is' as if that explains anything. Great writers and thinkers are defined by their refusal to settle for it.
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