It was a reasoned/reasonable argument.
It was an unnecessary argument.
Are these correct adjectives for argument?
Yes. it" for natural collocations. You can see all kinds of usage of phrases.
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Yes. Try the site "fraze.it" for natural collocations. You can see all kinds of usage of phrases.
https://fraze.it/n_search.jsp?q=%22reasoned+argument%22&l=0
If you get zero results, it is not a good phrase. Try something else.
kumenglishAre these correct adjectives for argument?
Yes.
Here's another way to test your word combinations: