莫衷一是

mò zhōng yī shì

unable to agree on which is right

Character by character

莫mò
none

衷zhōng
decide

一yī
one

是shì
right

这种病到底怎么引起的，专家们说法不一，莫衷一是。

What actually causes this illness? The experts all say different things and cannot agree.

Tone: neutral.

衷 here means “to judge between” (as in 折衷). Said of a group of opinions, never of one undecided person (for that, 犹豫不决). Often follows 众说纷纭 or 说法不一.

Learn this in Lesson 219 · HSK 9+: 俗语打架 (When proverbs disagree)

A dialogue, a reading, word cards with audio and a drill that uses it, in Learn Chinese with Bao. The first lessons of every level are free.