lowdown

Short definition from Wiktionary

Noun

1. 1
   inside information, the story or truth.
2. 2
   A lowlife, a despicable person.

Adjective

1. 1
   Unfair; scoundrelly; shameful.
2. 2
   seedy, sketchy, disreputable
3. 3
   down low; purporting to be heterosexual while engaged in sex with men.

Adverb

1. 1
   Unfairly; dishonourably; in a deceitful or mean manner.