What does blacklist mean?
A blacklist is a roster of people, groups, or things deemed unacceptable, dangerous, or deserving of punishment, used as a basis for exclusion or restriction. The word functions both as a noun — 'his name appeared on the blacklist' — and as a verb meaning to add someone to such a list, often with serious professional or social consequences. Its most notorious application came in mid-twentieth-century America, when entertainment industry figures were denied work over alleged communist ties, an episode known simply as the Hollywood Blacklist. Today the term appears frequently in technology, where blacklists block spam senders, malware sites, or suspicious IP addresses, alongside their counterpart whitelists or allowlists. Because it implies deliberate exclusion and often collective action against the named parties, the word carries strongly negative connotations and should be chosen carefully in formal writing.
A list of people, groups, or things regarded as unacceptable, suspect, or deserving of exclusion or penalty.
"The airline maintained a blacklist of passengers barred from boarding due to disruptive behavior."
To place someone or something on a blacklist; to exclude or penalize them accordingly.
"Several publishers blacklisted the journalist for fabricating quotes."
Regular pluralization; commonly used when referring to multiple industry, corporate, or technical blacklists.
"Different email providers keep separate blacklists of known spam servers."
The word 'blacklist' became infamous in 1947 when Hollywood studios banned screenwriters suspected of communist sympathies — ruining careers and giving the term a permanent place in the language.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of blacklist
Blacklist combines 'black', long associated in English with disgrace, illegality, or censure, and 'list'. It emerged in seventeenth-century England, originally referring to lists of persons marked for punishment or disapproval. The compound spread widely in the nineteenth and twentieth centuries, particularly through labor disputes and Cold War-era political persecution. Its counterpart 'whitelist', denoting approved rather than banned entries, arose later by direct analogy.
Related word forms
How blacklist is actually used
Carries strong negative connotations of punishment, surveillance, or exclusion. In modern technical contexts (email filtering, network security), it is increasingly paired neutrally with 'allowlist' or 'whitelist'. The Hollywood Blacklist of the late 1940s–1950s is its most famous historical use.
Easily confused with blacklist
A whitelist is the opposite of a blacklist — it names people or things that are explicitly approved or allowed, rather than excluded.