Option 1: Contented -> This is an antonym (opposite) of disgruntled, meaning satisfied and happy.
Option 2: Dissatisfied -> This directly means unhappy or not satisfied, which is the core meaning of disgruntled.
Option 3: Dismayed -> This means distressed or shocked, which is related but implies more alarm than disgruntled.
Option 4: Disgraced -> This means shamed or dishonored, which is entirely different from being disgruntled.
Hence, Option 2: Dissatisfied -> "Disgruntled" means discontented or unhappy, especially due to unfair treatment or unmet expectations, which is synonymous with dissatisfied -> correct