disgruntled

adj

1. In a dissatisfied, frustrated, or upset mood; in a bad temper or ill humour.

   “disgruntled employees preparing to strike over the lack of progress in talks with their employer on pay and conditions”

   “About John Marin, there move sad, disgruntled beings, full of talk and lamentations. […] They bewail the fact that in America, soil is poor and unconducive to growth, and men remain unmoved by growing green. But Marin persists, and what ebullience and good humour, in the rocky ungentle loam?”

   “A good proportion of British Railways' most disgruntled main line passengers will be found among those who have to make long-distance journeys at week-ends, when trains are apt to be diverted and re-timed because of large-scale engineering works.”

verb

1. (form-of, participle, past)simple past and past participle of disgruntle