Tā zhège rén liǎngbiāndǎo, cónglái méiyǒu zìjǐ de zhǔzhāng.
He sways with whichever side is stronger; he never has his own opinion.
Tips
usage
Different from 墙头草 (a person who always leans with the wind): 两边倒 focuses on the act of swaying itself, rather than labeling the person. Negative in tone - suggests cowardice or lack of conviction.
