Dead serious adjective phrase
Said when one is absolutely serious or not joking in any way
A: "You're joking, right?" B: "No, I'm dead serious."
Kenny is dead serious about moving out.
To think or consider something seriously
To be very serious
If you say that someone or something is too hot to handle, you mean that they are too difficult or dangerous to cope with.
When a matter becomes serious, or problematic.