What are the antonyms for Being pistol?

• adj.

  • competent
  • impotent
  ,
  • inadequate
  ,
  • incapable
  ,
  • incompetent
  ,
  • inefficient
  ,
  • inept
  ,
  • insufficient
  ,
  • unable
  ,
  • unqualified
  ,
  • unskilled
  ,
  • unsuitable
  .

Well up on is typically used to describe someone who possesses a great amount of knowledge or expertise on a particular subject. However, there are several antonyms for this phrase...