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1.
-noun
1. Incredibly timid and a massive coward. Emphasis on the superlatives in the previous sentence; this phrase is the pinnacle of all derogatory remarks regarding a person's cowardice.

-verb phrases
1. to be a craven cur: This could replace any insult that would otherwise be considered too obnoxious or inappropriate at the time being. If your friend buys milk instead of orange juice, instead of yelling "you fucking idiot!" at him, you could say "craven cur!"
-noun
John: What have you done!
Jane: Well, I snuck into your house, ambushed your family, and didn't even give them a chance to fight back.
John: Craven cur!

-verb phrases
John: I brought milk home!
Jane: You craven cur! I told you to bring orange juice!