1. 
[syn: annoyed, irritated, miffed, nettled, peeved, pissed, pissed off, riled, roiled, steamed, stung]
The Collaborative International Dictionary of English v.0.48:
pissed \pissed\, pissed off \pissed off\, a.
   Angered or very annoyed. [vulgar]
   [PJC]
WordNet (r) 3.0 (2006):
pissed off
    adj 1: aroused to impatience or anger; "made an irritated
           gesture"; "feeling nettled from the constant teasing";
           "peeved about being left out"; "felt really pissed at her
           snootiness"; "riled no end by his lies"; "roiled by the
           delay" [syn: annoyed, irritated, miffed, nettled,
           peeved, pissed, pissed off, riled, roiled,
           steamed, stung]
Moby Thesaurus II by Grady Ward, 1.0:
24 Moby Thesaurus words for "pissed off":
   angered, angry, browned-off, choleric, cross, heated, incensed,
   indignant, irate, ireful, livid, mad, pissed, riled up, shirty,
   sore, ticked off, underworld, waxy, worked up, wrathful, wrathy,
   wroth, wrought-up