* Non-recyclable: This is the most straightforward opposite, simply stating that something cannot be recycled.
* Disposable: This implies that an item is meant to be used once and then thrown away.
* Unusable: This suggests that an item has reached the end of its useful life and cannot be repurposed.
* Wasteful: This emphasizes the negative environmental impact of not recycling.
The best opposite for "recyclable" depends on the specific context.