Watch is neither airtight nor a slipper.
No shoes are food.  All slippers are shoes. A thing is either food or clothes. No wearable things are airtight. All clothes are wearable.  If a watch is not airtight and clothes, then a watch is either both airtight and clothes, or neither airtight nor clothes.
∀x (Shoes(x) → ¬Food(x)) ∀x (Slipper(x) → Shoes(x)) ∀x (Food(x) ⊕ Clothes(x)) ∀x (Wearable(x) → ¬AirTight(x)) ∀x (Clothes(x) → Wearable(x)) ¬(AirTight(watch) ∧ Clothes(watch)) → (AirTight(watch) ∧ Clothes(watch)) ⊕ (¬AirTight(watch) ∧ ¬Clothes(watch))