MOODY
1) He was quite moody in the morning.
2) Why was she so moody all day yesterday?

NERD
1) Why do you have to be such a nerd?
2) I don´t think he is a nerd.

MINGLE
1) Mike liked mingling with movie stars.
2) Everybody forced her to mingle.

DODGY
1) He made (earned) a lot of money because he used some very dodgy methods.
2) If you get into a dodgy situation, call me.