enigma   (Sound)

The enigma has 2 Senses.

• closed book, mystery, secret, enigma
• 不思議, 怪事, 不可思議, 怪奇, ミステリー, 不可解, ミステリ, 神秘, 怪, なぞ, はっきりしないこと
• something that baffles understanding and cannot be explained; "how it got out is a mystery"; "it remains one of nature's secrets"
• 理解するすべがなく説明できないもの

• brain-teaser, riddle, conundrum, enigma
• 謎, 難問, エニグマ
• a difficult problem
• 難しい問題