bizarre theory; strange theory; wild theory
Refers to an unusual, eccentric, or far-fetched idea or hypothesis, often in academic or intellectual contexts.
He put forward a bizarre theory at the meeting.
その奇説は専門家から一笑に付された。
The wild theory was laughed off by the experts.
Compound of 奇 (ki, 'strange, odd') and 説 (setsu, 'theory, opinion').