lowlife

Short definition from Wiktionary

Adjective

1. 1
   Lacking morality.
2. 2
   Seemingly mischievous and troublesome to society.

Noun

1. 1
   An untrustworthy, despicable, or disreputable person, especially one suspected of being a criminal.
2. 2
   A person who is rebuked by their community for their behavior.
3. 3
   A person of low socio-economic status, especially due to their illicit background.