Synonyms for «tough argument»

Synonyms for individual words can be found below.

That's a pretty tough argument to carry... (religion.blogs.cnn.com)
But it could be a tough argument to win. (crainsnewyork.com)
William offers a lot more defensively, but in the way of attacking I think Walcott is best, though lately he hasn't played so it's a tough argument to make. (justarsenal.com)
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