Daily Chinese Idiom Guessing Game
Unimaginable or outrageous; beyond what is normal or reasonable.
匪不是；夷平常。指言谈行动离奇古怪，不是一般人根据常情所能想象的。
《周易·涣》涣有丘，匪夷所思。”
The architect's proposal to build a skyscraper upside down was simply匪夷所思.