Well, I found eight examples of "dead-on serious". (I checked again.)
Well, I found right examples of "dead-on serious".
True; I value your guys' opinions because I find it hard to tell if a phrase feels right to a native just because some people from linguee texts used it.I still say no.
It doesn't matter what you can find on the web. I could give you a billion examples of incorrect nonsense but that doesn't mean it's good English. I think what ghoul really means to ask is whether we think he should say it.
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