1. having a defect

Similar word(s): imperfect, defective

2. characterized by errors; not agreeing with a model or not following established rules

- he submitted a faulty report

Similar word(s): inaccurate, incorrect, wrong

Sentences with faulty as an adjective:

- They replaced the faulty wiring and it has worked fine ever since.

- I don't think you can infer that from the premise. It's a faulty argument.