We think a disgruntled employee was the one who planted the bomb.

Tom was a little disgruntled.

The police suspect that a disgruntled former employee was the one who set the factory on fire.

I'd rather get the sack than not join the labour union," said the disgruntled worker.

Disgruntled coworkers can be a big pain.

Tom is disgruntled.

Yanni was murdered by a disgruntled employee.

Tom was disgruntled.

Tom seemed a little disgruntled.

How do you know that this wasn't done by a disgruntled employee?