You are a liar.
あなたは嘘つきだ。
You are a liar.
You are the biggest liar.
You are all liars.
You guys are liars.
You are naughty.
You are hasty.
You are a fool.
You are a persistent person.
You are morons.
You guys are idiots.
You guys are stupid.
You're morons.
You're all morons.
You are Taro.
Your inferiority complex makes you think [say] that.
You are a coward.
You are mean.
You are unfair.