adjective not able to be returned or given back
In legal contexts, 'unreturnable' could pertain to contracts or agreements that are considered final and cannot be reversed or canceled.
In manufacturing, 'unreturnable' could refer to defective products that are deemed unsalvageable and cannot be returned to the production line for rework or repair.
In library science, 'unreturnable' may describe books or materials that are not allowed to be borrowed or taken out of the library.
In retail, the term 'unreturnable' is used to describe items that cannot be returned for a refund or exchange, typically due to hygiene reasons or the nature of the product.
In shipping, 'unreturnable' may refer to packages or goods that are not eligible for return to the sender, often due to being perishable or hazardous.