jackleg

/JH AE1 K L EH0 G/
noun
  1. 1

    A type of drill operated by means of compressed air.

  2. 2

    An amateur; an untrained or incompetent person.

  3. 3

    A shyster or con artist; a gambler who cheats; a generally dishonest or reprehensible person.

adjective
  1. 1

    Amateur, untrained; incompetent.

  2. 2

    Dishonest, unscrupulous.

  3. 3

    Ineptly built or operated; makeshift.

Source: https://en.wiktionary.org/wiki/jackleg