最合理的
最全面的
最健康的（sound的最高级）

Sound \Sound\, a. [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.

3. Firm; strong; safe.

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.