The Collaborative International Dictionary of English v.0.48:

Wrathful \Wrath"ful\, a.
   1. Full of wrath; very angry; greatly incensed; ireful;
      passionate; as, a wrathful man.
      [1913 Webster]

   2. Springing from, or expressing, wrath; as, a wrathful
      countenance. "Wrathful passions." --Sprat.
      [1913 Webster]

   Syn: Furious; raging; indignant; resentful.
        [1913 Webster] -- Wrath"ful*ly, adv. --
        Wrath"ful*ness, n.
        [1913 Webster]

WordNet (r) 3.0 (2006):

wrathful
    adj 1: vehemently incensed and condemnatory; "they trembled
           before the wrathful queen"; "but wroth as he was, a short
           struggle ended in reconciliation" [syn: wrathful,
           wroth, wrothful]

Moby Thesaurus II by Grady Ward, 1.0:

21 Moby Thesaurus words for "wrathful":
   angered, angry, browned-off, cross, heated, incensed, indignant,
   irate, ireful, livid, mad, pissed, pissed-off, riled up, sore,
   ticked off, waxy, worked up, wrathy, wroth, wrought-up