Verse Comparison: Exodus 6:12
American Standard Version
And Moses spake before Jehovah, saying, Behold, the children of Israel have not hearkened unto me; how then shall Pharaoh hear me, who am of uncircumcised lips?
Amplified® Bible
But Moses said to the Lord, Behold, [my own people] the Israelites have not listened to me; how then shall Pharaoh give heed to me, who am of deficient {and} impeded speech?
Contemporary English Version
But Moses replied, "I'm not a powerful speaker. If the Israelites won't listen to me, why should the king of Egypt?" 
Darby English Version
And Moses spoke before Jehovah, saying, Lo, the children of Israel do not hearken to me: how then should Pharaoh hearken to me, to me of uncircumcised lips?
Good News Bible
But Moses replied, "Even the Israelites will not listen to me, so why should the king? I am such a poor speaker." 
King James Version
And Moses spake before the LORD, saying, Behold, the children of Israel have not hearkened unto me; how then shall Pharaoh hear me, who am of uncircumcised lips?
New American Standard Bible
But Moses spoke before the LORD, saying, "Behold, the sons of Israel have not listened to me; how then will Pharaoh listen to me, for I am unskilled in speech?"
New International Version
But Moses said to the LORD, "If the Israelites will not listen to me, why would Pharaoh listen to me, since I speak with faltering lips ?"
New King James Version
And Moses spoke before the LORD, saying, “The children of Israel have not heeded me. How then shall Pharaoh heed me, for I am of uncircumcised lips?”
N.A.S.B. in E-Prime
But Moses spoke before the LORD, saying, "Behold, the sons of Israel have not listened to me; how then will Pharaoh listen to me, for I have no skill in speech?" 
Revised Standard Version
But Moses said to the LORD, "Behold, the people of Israel have not listened to me; how then shall Pharaoh listen to me, who am a man of uncircumcised lips?"
Young's Literal Translation
and Moses speaketh before Jehovah, saying, `Lo, the sons of Israel have not hearkened unto me, and how doth Pharaoh hear me, and I of uncircumcised lips?'