Decry or decry means to disparage or condemn, especially in public --
He enjoys any opportunity to decry the ignorance and apathy of the voting public.
In ancient times, the government would decry the coinage; it all had to be traded for new coins, at a rate set by the same government.
Descry or descry means to see or to perceive, as something distant or indistinct --
If you look past that spire, you may descry the village through the fog.
He is astute; he will descry the least trace of insincerity.
Now that you know that, you can say --
"He fancies himself able to descry every petty error, and is always ready to decry the perpetrator."
