Phono-semantic — one part hints at the meaning, another at the sound
Example phrases
他在会议上突然发火,弄得大家莫名其妙。Tā zài huìyì shàng tūrán fāhuǒ, nòng de dàjiā mòmíngqímiào.He suddenly lost his temper in the meeting, leaving everyone baffled.
她莫名其妙地哭了起来,谁也不知道为什么。Tā mòmíngqímiào de kū le qǐlái, shéi yě bù zhīdào wèishénme.She burst into tears for no apparent reason, and nobody knew why.
这件事真是莫名其妙,我什么都没做,他却生气了。Zhè jiàn shì zhēn shì mòmíngqímiào, wǒ shénme dōu méi zuò, tā què shēngqì le.This is baffling: I did not do anything, yet he got angry.