guaranteed
adjective
uk/ˌɡærənˈtiːd/ us COMMERCE
if a product is guaranteed, the company that made it promises to repair it, change it, or return the customer’s money if a fault develops within a particular period of time:
We offer franchise businesses with a guaranteed minimum income.
All our appliances are guaranteed for life.
used to say that something is sure to happen or be true:
Lowest prices, guaranteed!