unnið

In a sentence

• Þeir hafa unnið hörðum höndum að verkefninu.

  They have worked hard on the project.

  Here, 'unnið' is the past participle of the verb 'vinna', used to describe completed work.

• Ég hef aldrei unnið við þjónustustörf.

  I have never worked in service jobs.

  In this sentence, 'unnið' describes past experience in a professional context.

• Skemmdin hefur verið unnið á en má betur fara.

  The damage has been worked on but could be improved.

  This usage of 'unnið' demonstrates an action being performed on an object, reflecting in the passive voice.