loudmouthed

from The Collaborative International Dictionary of English v.0.48

Loud-mouthed \Loud"-mouthed`\, a.
   Having a loud voice; talking or sounding noisily; noisily
   impudent or offensive.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

28 Moby Thesaurus words for "loudmouthed":
      bawling, blatant, boanergean, boisterous, brawling, brazen-mouthed,
      clamorous, clamoursome, crying, full-throated, loud-voiced,
      multivocal, noisy, obstreperous, openmouthed, screaming, shouting,
      stentorian, strident, trumpet-tongued, trumpet-voiced, vociferant,
      vociferating, vociferous, yammering, yapping, yelling, yelping