# enigma

/ɪˈnɪɡmə/ (US) · /ɛnˈɪɡmɐ/ (UK) · CEFR C1 · Noun

Source: https://englishreference.com/word/enigma
Updated: 2026-05-07

## Definition

something or someone that is mysterious and very difficult to understand.

For teachers: a person, thing, or situation that is mysterious, puzzling, or difficult to interpret. Often carries a connotation of intellectual challenge or intrigue.

## Examples

- The reason for his sudden departure remains an enigma.
- Despite years of research, the purpose of the ancient stone circle remains a complete enigma to archaeologists.
- The reclusive billionaire was a true enigma, rarely appearing in public and never granting interviews to the press that obsessed over his private life.

## Usage notes

- Often paired with the verbs 'remain' or 'be'.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.