WordNet sense 1 (lacking sufficient water or rainfall):

waterless

WordNet sense 2 (free from liquid or moisture; lacking natural or normal moisture or depleted of water; or no longer wet):

dry

WordNet sense 3 (lacking vitality or spirit; lifeless):

desiccate, desiccated, desiccate

WordNet sense 4 (lacking in liveliness or animation):

dull