Source : Webster's Revised Unabridged Dictionary (1913)

Loud \Loud\, adv. [AS. hl[=u]de.]
   With loudness; loudly.

         To speak loud in public assemblies.      --Addison.

Loud \Loud\, a. [Compar. {Louder}; superl. {Loudest}.] [OE.
   loud, lud, AS. hl?d; akin to OS. hl?d, D. luid, OHG. l?t, G.
   laut, L. -clutus, in inclutus, inclitus, celebrated,
   renowned, cluere to be called, Gr. ? heard, loud, famous, ?
   to hear, Skr. ?ru. ?. Cf. {Client}, {Listen}, {Slave} a
   serf.]
   1. Having, making, or being a strong or great sound; noisy;
      striking the ear with great force; as, a loud cry; loud
      thunder.

            They were instant with loud voices, requiring that
            he might be crucified.                --Luke xxiii.
                                                  23.

   2. Clamorous; boisterous.

            She is loud and stubborn.             --Prov. vii.
                                                  11.

   3. Emphatic; impressive; urgent; as, a loud call for united
      effort. [Colloq.]

   4. Ostentatious; likely to attract attention; gaudy; as, a
      loud style of dress; loud colors. [Slang]

   Syn: Noisy; boisterous; vociferous; clamorous; obstreperous;
        turbulent; blustering; vehement.

Source : WordNet®

loud
     adv : with relatively high volume; "the band played loudly"; "she
           spoke loudly and angrily"; "he spoke loud enough for
           those at the back of the room to hear him"; "cried
           aloud for help" [syn: {loudly}, {aloud}] [ant: {softly}]

loud
     adj 1: characterized by or producing sound of great volume or
            intensity; "a group of loud children"; "loud thunder";
            "her voice was too loud"; "loud trombones" [ant: {soft}]
     2: tastelessly showy; "a flash car"; "a flashy ring"; "garish
        colors"; "a gaudy costume"; "loud sport shirts"; "a
        meretricious yet stylish book"; "tawdry ornaments" [syn: {brassy},
         {cheap}, {flash}, {flashy}, {garish}, {gaudy}, {gimcrack},
         {meretricious}, {tacky}, {tatty}, {tawdry}, {trashy}]
     3: used chiefly as a direction or description in music; "the
        forte passages in the composition" [syn: {forte}] [ant: {piano}]