Mope around
Definition 1 of 1
Pro Tip 1/3Emotional State
Means feeling sad or hopeless. Often used when someone shows their sadness through inaction or low energy. 
She's been moping around ever since her friend moved away.
Pro Tip 2/3Colloquial Use
Common in casual conversation, not suitable for formal writing or speeches. 
Stop moping around and cheer up, let's go out!
Pro Tip 3/3Negative Activity
It implies a lack of productivity or helpful activity during the period of feeling low. 
He's just moping around instead of looking for a new job.