enigma

The Simple English Wikipedia has an article on:

Enigma

Pronunciation

• IPA ^(key): /əˈnɪgmə/
• SAMPA: /@"nIgm@/

• Audio (US)

  (file)

Noun

Singular enigma

Plural enigmas

1. An enigma is something that is mysterious, puzzling, or cannot be explained.

   That man is an enigma; I never know what he's going to do next.

2. An enigma is a riddle, or a difficult problem.

Related words

• enigmatic