My neighbour is saying horrible things about me to the neighborhood slandering my name and told my co workers these rumors as well. As a result, I might lose my job. Is this defamation?
Another matter to consider is the cost of pursuing a defamation case compared with the compensation you're seeking (or loss incurred as a result). Is it worth such an action? Before pursuing a defamation action, consider applying for an injunction to restrain your neighbour (if it's just specific people) from spreading negative false statements about you.
I suggest contacting your local community legal centre first. They offer free advice and can help you in how to apply for an injunction in QLD. Otherwise, contact QCAT to enquire about initiating this procedure. You can also look into mediation with your neighbour. This is a free service and may resolve your dispute without having to resort to court.