mock ‧ e ‧ ry /ˈmɒkəri $ ˈmɑː-/ BrE AmE noun
1 . make a mockery of something to make something such as a plan or system seem completely useless or ineffective:
This building plan makes a mockery of the government’s environmental policy.
2 . [uncountable] when someone laughs at someone or something or shows that they think they are stupid:
There was a hint of mockery in his voice.
3 . [singular] something that is completely useless or ineffective:
She said that the trial had been a mockery.