vo·cif·er·ous (vō-sĭf'ər-əs) adj. Making, given to, or marked by noisy and vehement outcry. vo·cif'er·ous·ly adv., vo·cif'er·ous·ness n.
Synonyms: These adjectives mean conspicuously and usually offensively loud. Vociferous suggests a noisy outcry, as of vehement protest: vociferous complaints. Blatant connotes coarse or vulgar noisiness: "Up rose a blatant Radical" (Walter Bagehot). Boisterous implies unrestrained noise, tumult, and often rowdiness: boisterous youths. Strident stresses offensive harshness, shrillness, or discordance: a legislator with a strident voice. Something clamorous is both vociferous and sustained: a clamorous uproar.
1611, from L. vociferari "to shout, yell," from vox (gen. vocis) "voice" + root of ferre "to carry" (see infer). A noun form, vociferation, is recorded from c.1400.