Iltica wrote:"Desertic" sounds rather goofy IMO. Historically, the term "tropical" has been used sometimes but that might not adequately describe your super-desert.
What? Tropical is rather the opposite of desert: deserts are defined by their aridity while tropical climates are defined by their non-aridity, with high levels of moisture and generally high annual rainfall totals.
The adjective form of "desert" is simply "desert" in any event, which is why "desertic" sounds odd.