What does enigma mean?
An enigma is something—or someone—that resists explanation or understanding. The word describes a mystery that invites but frustrates interpretation: an unsolved crime, a baffling historical artifact, or a person whose motives remain opaque despite close acquaintance. Calling someone an enigma usually carries a tone of fascination rather than criticism; it suggests depth and intrigue rather than fault. A secondary, older sense treats an enigma as a deliberate puzzle—a riddle posed in obscure language for others to decode, a usage now mostly confined to literary contexts. The word entered English in the sixteenth century from Latin aenigma, itself borrowed from Greek ainigma, derived from ainissesthai, meaning 'to speak in riddles.' It shares this root with the adjective enigmatic. Familiar to modern audiences through the German Enigma cipher machine of World War II, the word endures as a precise, elegant way to name what we cannot yet explain.
A person or thing that is mysterious, puzzling, or difficult to understand.
"The ancient script has been an enigma since its discovery."
Frequently applied to people to convey inscrutability.
A riddle or cryptic utterance posed as a puzzle.
"The oracle answered only in enigmas."
This older sense is now chiefly literary or historical.
Standard regular plural; used when referring to multiple mysteries or riddling statements.
"Her letters are full of contradictions and enigmas."
The word 'enigma' comes from the same Greek root as 'riddle' — and it gave its name to the WWII cipher machine whose codebreakers changed the course of history.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of enigma
English acquired 'enigma' in the sixteenth century via Latin aenigma, which itself derives from Greek ainigma ('dark saying, riddle'), from the verb ainissesthai, 'to speak in riddles,' related to ainos, 'tale or fable.' The word has remained remarkably stable in form and sense since its adoption. Its Greek origin connects it to the broader tradition of riddle-making, and it yields the adjective 'enigmatic' and related forms.
Related word forms
How enigma is actually used
Register: neutral to formal; common in journalism and literary criticism. Often used of people ('he's an enigma') to suggest inscrutability without negative judgment. The older sense of a posed riddle is now largely literary or historical.
Easily confused with enigma
Lowercase 'enigma' means any puzzle or mystery, while capitalized 'Enigma' typically refers specifically to the German cipher machine of World War II.