What is the prefix for word not handled properly?

There isn't one single perfect prefix for "not handled properly". The best choice depends on the specific context and nuance you want to convey. Here are some options with their meanings:

General Negative Prefixes:

* Mis-: Implies a mistake or error in handling. Example: "mismanaged"

* Mal-: Implies something bad or harmful in the handling. Example: "maltreated"

* Un-: Indicates the opposite of being handled properly. Example: "unattended"

* Dis-: Indicates a lack of proper handling. Example: "disregarded"

More Specific Prefixes:

* In-: Indicates a lack of something needed for proper handling. Example: "inadequately handled"

* Improperly: Directly indicates not handled in the correct way. Example: "improperly stored"

Alternatives:

* Negligently: Implies carelessness or lack of due diligence in handling.

* Unsuccessfully: Indicates that the handling attempt failed.

* Ineffectively: Suggests that the handling did not achieve the desired outcome.

The best prefix to use will depend on the specific situation and the meaning you want to convey.