Disgruntle (verb)

To make someone dissatisfied or annoyed.

Origin:

Mid 16th century (in the sense "put out of countenance"): from dis- (expressing reversal) + gruntle (verb), from grunt (noun).

Examples:

1. The new policy has disgruntle employees.
2. The manager's decision to lay off workers has disgruntle many employees.
3. He was quick to take offense and easy to disgruntle.
4. The delay in payment has disgruntle the supplier.
5. The bad service at the restaurant has disgruntle the customer.