mal-mal- /mæl/ prefix 
bad or badly: 
a malformed limb (=wrongly shaped) The children had been maltreated (=treated cruelly).
bad or badly: a malformed limb (=wrongly shaped) The children had been maltreated (=treated cruelly).- unimpeded
- unimportant
- unimpressed
- unimpressive
- uninformed
- uninhabitable
- uninhabited
- uninhibited
- uninhibitedly
- uninitiated
- uninspired
- uninspiring
- uninstall
- unintelligible
- unintelligibly
- unintentional
- unintentionally
- uninterested
- uninterrupted
- uninterruptedly
- uninvited
- uninviting
- union
- Unionism
- unionism