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mock‧e‧ry

1 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.
make a mockery of something
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.
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.
She said that the trial had been a mockery.