The judge's presence lent a more serious tone to our dinner group.
He was serious yesterday.
The look on her face was very serious.The injuries are very serious.If you don't take your school work serious no good will come to you in life.I'm serious I didn't do it!
the lady was really serious
John is a very serious man This is a very serious matter
Soon, the reality of death sunk in, and I realized that my disease was more serious than I had anticipated.
"thoughtful not joking" is not a sentence and it does not contain the word "serious". Serious is an adjective, a word that describes a noun. Example: Justin has a serious expression on his face. The adjective "serious" describes the noun "expression".
"Are you serious?"
"They" is the subject of that sentence.
Solemn means "serious", so you could say "when he told me of my friend's death, he looked very solemn".
"this play i serious so act like you care"
There are many people who are serious about school, while others are not.
'I want to be in a serious relationship.'
The sentence should be punctuated as: "The district attorney you're serious about has been arrested."