an expression of agreement that is not supported by real conviction
"He nodded enthusiastically at every proposal during the meeting, but his silence later proved he never truly believed any of them."
insincerity by virtue of pretending to have qualities or beliefs that you do not really have
"She criticized everyone for smoking while secretly lighting a cigarette behind her back, proving her hypocrisy."
The contrivance of a false appearance of virtue or goodness, while concealing real character or inclinations, especially with respect to religious and moral beliefs; hence in general sense, dissimulation, pretence, sham.
"The politician's public denunciation of corruption looked like genuine hypocrisy when he was caught accepting bribes just days later."