Is there another way of saying 'user-unfriendly'?

The direct antonym of user-friendly is user-hostile (urban dictionary), a word used frequently amongst those in the user experience fields:

  • Jakob Nielsen (2)
  • Alex Payne (of Twitter)
  • Peter-Paul Koch (of Quirksmode)
  • Russell Beattie (of Yahoo and Nokia)

A couple options:

Unintuitive

Clunky


Unwieldy implies that something is difficult to control, and can be applied to computer user-interfaces or physical devices.


A couple of other words that might be appropriate:

  • Awkward
  • Frustrating

If there are accessibility issues, you might call it inaccessible