This grammar provides an overall description of Gaagudju, a now nearly extinct language of northern Australia. Gaagudju differs from most previously described Australian languages in a number of ways. It shows marked differences in the realizations of stressed and unstressed syllables. It has complex systems of prefixation as well as suffixation. There is a clear distinction between productive and unproductive morphology, with a large amount of the morphology being unproductive. While word order is generally free, strictly ordered phrasal compounding structures are important.