nonreturnable

nonreturnable /ˌnɑːnrɪˈtɚnəbəl/ adjective
nonreturnable
/ˌnɑːnrɪˈtɚnəbəl/
adjective
Britannica Dictionary definition of NONRETURNABLE
1 
: not allowed to be returned to a store for money or something of similar value
2 
: not to be returned