stick person
A person with a stick up their ass, someone who never has any fun or makes fun plans with other people or the group.
"Hey Noah let's go to the movies"
"nah I don't want to waste my money on that."
"Jesus christ, you're a fucking stick person."
"nah I don't want to waste my money on that."
"Jesus christ, you're a fucking stick person."
stick to it personality
Got to get it done.
She is great for the job, she has a stick to it personality.