Synonyms for «valid defense»

Synonyms for individual words can be found below.

If I believe that the Three Little Pigs were the creators does that give me some sort of valid defense? (religion.blogs.cnn.com)
But in my opinion, the greatest problem is that truth is not a valid defense! (religion.blogs.cnn.com)
But this is not a valid defense for a doctrine that portrays God to be the worst monster our minds could ever conceive. (nakedpastor.com)
(see all sentences)