Pluralistic ignorance
Etymology
Coined by American psychologist Floyd Allport and his student Daniel Katz in the late 1920s–30s. "Pluralistic" derives from Latin "pluralis" ("of many"); "ignorance" from Latin "ignorare" ("not to know"). The paradox is a shared ignorance about what others truly think. Flagged as a coinage.
noun phrase · /ploor-uh-LIS-tik IG-ner-uhns/
A situation where most people privately reject a norm but wrongly assume everyone else accepts it, so no one speaks up.
What it names
Explains how unpopular rules and emperor’s-new-clothes silences persist — everyone conforms to a consensus that does not actually exist.
Example
In the seminar, pluralistic ignorance kept everyone nodding along to a muddled paper each student privately found unconvincing.
Related idea
Distinct from the bystander effect, though related; that is about diffused responsibility to act, while pluralistic ignorance is about misreading others’ private beliefs.