Association ..

  1. Language :: barrier
  2. Obvious :: no kidding
  3. Skull :: hard
  4. Insidious :: devious (no idea why that popped to mind)
  5. Struggle :: strength
  6. Unspeakable :: no comment
  7. Orchid :: flower
  8. Fish :: swim
  9. Annoyingly :: me
  10. Payroll :: tax

.. holy crap I had no idea this thing was still going  .. thanks Fiona!