阳奉阴违

yáng fèng yīn wéi

outward devotion but inner opposition (idiom); to pay lip service

to agree overtly, but oppose in secret

阳

yáng

positive (electric.)

奉

fèng

to offer (tribute)

阴

yīn

variant of 陰|阴[yin1]

违

wéi

to disobey