nonlosable
/nɒnˈloʊzəbəl/Definitions
1. adjective
Capable of not being lost, unloseable, or impossible to misplace.
“This new technology is nonlosable, ensuring that your phone is always traceable.”
2. adverb
In a way that is not capable of being lost, unloseably, or in an impossible-to-misplace manner.
“She found the nonlosable key hidden under the couch cushion.”