unknown unknown

Fetched 2026-10-26 (cache).

Synonyms: known unknown

Antonyms: known unknown

Related words from Datamuse; suggestions, not definitions.

Noun

1. An [[uncertainty]] of unknown magnitude, consequence, structure, and probability characteristics, possibly with completely unsuspected existence; something that we don't know that we don't know.

Source: Wiktionary · CC BY-SA 4.0 (Wiktionary dump) · cached copy, not a rewrite.