"Tinder-dry" is used to describe something that is extremely dry and flammable, such as dry leaves or wood. However, there are several other words that can be used as alternatives to this term. One possible synonym is "arid", which refers to a place or region that lacks moisture and vegetation. Another option is "parched", which describes something that has become dry due to exposure to heat and sunlight. "Desiccated" is another synonym that refers specifically to something that has been dried out completely. Other possible alternatives include "bone-dry", "ultracrisp", and "dehydrated". Whatever the term used, the message is always clear - be cautious around anything that is tinder-dry.