adjective, louder, loudest.
(of sound) strongly audible; having exceptional volume or intensity: loud talking; loud thunder; loud whispers.
making, emitting, or uttering strongly audible sounds: a quartet of loud trombones.
clamorous, vociferous, or blatant; noisy: a loud party; a loud demonstration.
emphatic or insistent: to be loud in one's praises; a loud denial.
garish, conspicuous, or ostentatious, as colors, dress, or the wearer of garish dress: loud ties; a loud dresser.
obtrusively vulgar, as manners or persons.
strong or offensive in smell.
in a loud manner; loudly: Don't talk so loud.
out loud, aloud; audibly: I thought it, but I never said it out loud. Just whisper, don't speak out loud.

before 900; Middle English; Old English hlūd; cognate with Old Frisian, Old Saxon hlūd (Dutch luid), Old High German hlūt (German laut); akin to Greek klytós famous

loudly, adverb
loudness, noun
overloud, adjective
overloudly, adverb
overloudness, noun
unloudly, adjective

1. resounding; deafening; stentorian. Loud, noisy describe a strongly audible sound or sounds. Loud means characterized by a full, powerful sound or sounds, which make a strong impression on the organs of hearing: a loud voice, laugh, report. Noisy refers to a series of sounds, and suggests clamor and discordance, or persistence in making loud sounds that are disturbing and annoying: a noisy crowd. 5. gaudy, flashy, showy.

1. quiet.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
loud (laʊd)
1.  (of sound) relatively great in volume: a loud shout
2.  making or able to make sounds of relatively great volume: a loud voice
3.  clamorous, insistent, and emphatic: loud protests
4.  (of colours, designs, etc) offensive or obtrusive to look at
5.  characterized by noisy, vulgar, and offensive behaviour
6.  in a loud manner
7.  out loud audibly, as distinct from silently
[Old English hlud; related to Old Swedish hlūd, German laut]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. hlud "making noise, sonorous," from W.Gmc. *khluthaz "heard" (cf. O.Fris. hlud, M.Du. luut, Du. luid, O.H.G. hlut, Ger. laut "loud"), from PIE pp. *klutos- (cf. Skt. srutah, Gk. klytos "heard of, celebrated," Arm. lu "known," Welsh clod "praise"), from base *kleu- "to hear" (see
listen). The adv. is from O.E. hlude, from P.Gmc. *khludai. Application to colors first recorded 1849. Loudmouth (n.) first recorded 1934. Loudspeaker is from 1884.
Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Britannica


in acoustics, attribute of sound that determines the intensity of auditory sensation produced. The loudness of sound as perceived by human ears is roughly proportional to the logarithm of sound intensity: when the intensity is very small, the sound is not audible; when it is too great, it becomes painful and dangerous to the ear. The sound intensity that the ear can tolerate is approximately 1012 times greater than the amount that is just perceptible. This range varies from person to person and with the frequency of the sound

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
It turns out that loudness is not the only factor that determines how people react to urban soundscapes.
And the fact that it is pitch, not loudness, that tends to change from note to note.
And the loudness of your voice has to do with a guilty conscience.
Loudness of sound the related physical property is sound pressure level.
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