A grumpy co-worker is someone who is always in a bad mood and difficult to work with. The crossword solutions for this term are SNEEZY (6 letters), DOPEY (5 letters), and DOC (3 letters). SNEEZY is likely a reference to the character from Snow White and the Seven Dwarfs, who was always sneezing. DOPEY is another character from the same story, known for being slow-witted and clumsy. Finally, DOC is a nickname for a doctor, which could be used to describe someone who is always giving orders and acting superior.