The phrase "dry as a gourd" is often used to describe something arid and lacking moisture. Synonyms for this expression include "parched," "shrivel," and "desiccated." Other similar phrases that capture this sense of dryness include "bone-dry," "waterless," and "thirsty." When describing a lack of rainfall, "drought-ridden" or "barren" may fit the bill. If you're talking about a person's demeanor or humor, "stilted" or "flat" may convey a sense of dryness. And if you're talking about a drink, you might use the term "dehydrated" or "overly boozy" to suggest that it lacks the refreshing quality you're looking for.