From The Collaborative International Dictionary of English v.0.44 [gcide]:
Sound \Sound\, adjective [Compar. {Sounder}; superl. {Soundest}.] [OE. sound, AS. sund; akin to D. gezond, G. gesund, OHG. gisunt, Dan. & Sw. sund, and perhaps to L. sanus. Cf. {Sane}.]
1. Whole; unbroken; unharmed; free from flaw, defect, or decay; perfect of the kind; as, sound timber; sound fruit; a sound tooth; a sound ship.
2. Healthy; not diseased; not being in a morbid state; -- said of body or mind; as, a sound body; a sound constitution; a sound understanding.
The brasswork here, how rich it is in beams, And how, besides, it makes the whole house sound. --Chapman.
4. Free from error; correct; right; honest; true; faithful; orthodox; -- said of persons; as, a sound lawyer; a sound thinker.
Do not I know you a favorer Of this new seat? Ye are nor sound. --Shak.
5. Founded in truth or right; supported by justice; not to be overthrown on refuted; not fallacious; as, sound argument or reasoning; a sound objection; sound doctrine; sound principles.
Hold fast the form of sound words, which thou hast heard of me. --2 Tim. i. 13.
6. heavy; laid on with force; as, a sound beating.
7. Undisturbed; deep; profound; as, sound sleep.
8. Founded in law; legal; valid; not defective; as, a sound title to land.
Note: Sound is sometimes used in the formation of self-explaining compounds; as, sound-headed, sound-hearted, sound-timbered, etc.
{Sound currency} (Com.), a currency whose actual value is the same as its nominal value; a currency which does not deteriorate or depreciate or fluctuate in comparision with the standard of values.
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