riddle

US /ˈrɪd.əl/
UK /ˈrɪd.əl/
1.

câu đố, người bí ẩn, người khó hiểu, vật bí ẩn, vật khó dò, việc bí ẩn

a question or statement intentionally phrased so as to require ingenuity in ascertaining its answer or meaning, typically presented as a game.

:
they started asking riddles and telling jokes
1.

khó dò, nói lời khó hiểu, nói những lời bí ẩn

speak in or pose riddles.

:
he who knows not how to riddle