I’m wondering if an article is used with the word overkill:
- Something seems like an overkill (to me).
- Something seems like overkill (to me).
Which is grammatical?
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It depends what is meant by overkill.
ODO has overkill as a mass (uncountable) noun:
[Interestingly, OED indicates sense 2 came first, and the word has been applied more generally so that sense 1 is now what overkill usually means.]
Because it's a mass noun, overkill will not usually take the indefinite article.
Mass nouns can take the indefinite article when you are talking about a type of the thing: "Foccaccia is a bread". However it's difficult to conceive a sentence where overkill would fit like that.