As a Noun: 1. A weakness, imperfection or unsatisfactory feature of something. English = fault, failing, shortcoming. 2. The inability of someone to do something. English = failure. 3. A situation in which something stops working or does not do what it is supposed to do. English = failure. As a Verb or Adjective: 1. To have a weakness, imperfection or unsatisfactory feature. English = (be) faulty. 2. Of a machine or piece of equipment, to be not working properly. English = (be) faulty. 3. To try to do something but not succeed in doing it. English = fail.