Synonyms for Sound:

adj.

accepted, established (adjective)
loyal, faithful, dependable, secure, legal, sanctioned, go.
all (adjective)
good.
authoritative (adjective)
righteous, faithful.
complete, healthy (adjective)
solid, total, whole, flawless, substantial, unimpaired, well, thorough, stable, safe.
deep (adjective)
soulful, thoughtful, intellectual.
effective (adjective)
cogent.
healthy (adjective)
well, healthy.
logical, reasonable (adjective)
prudent, wise, cogent, true, valid, rational, judicious, well-grounded, thoughtful, deep, intellectual, reliable, fair, levelheaded, sensible, profound, orthodox.
proper (adjective)
orthodox, sanctioned, fair.
reasonable (adjective)
likely, wise, deductive, feasible, rational, inductive, plausible, intelligent, logical, sensible, reasonable, cogent, thinking, thought-out, conceivable.
sober (adjective)
Clear-headed.

n.

pure, in depth, outright, resounding, unadulterated. flawless, whole, spry, unimpaired, fine, normal. decibel, acoustic, above, break up, db, reliable, audible. hum, backing, burst, echo, clack, jabber, bebop, backup, whine, snort, thud, crackle, acid jazz, crash, boom, ambient, jangle, rumble, shrill, murmur, clank, whisper, reflect, quack, explode, rattle, ring out, blast, smash, roar, jar, moan, chatter, cackle, clap, quaver, slam, blare, sing, bluegrass, play, clink, trumpet, creak, blues, blow, bang, patter, snap, bark, background music, clang, acid house, buzz, shout, thump, resound, thunder, vibrate, clatter, babble, shriek, bhangra, reverberate, prattle, detonate, gabble. plumb, pick up on, gauge, greet, receive, mark, react, measure, pounce, rule, respond, come back, stand up, turn around and do something, examine. appear, give away, display, express yourself, surrender, render, offer, make no secret of something, manifest, show, seem. practical, utter, Grounded, balanced, realistic, verbalize, Clear-headed, say, pragmatic, mature. insightful, Sonance, perceptive, smart, incisive, meditative. harmless, innocuous, avoidable, earshot, hearing, preventable, protective, controllable. grow, come over, be, surface, form, look, feel. pronounce, probe, stutter, investigate, pronunciation, roll/trip/slip off the tongue, intone, diction, send up a trial balloon, stammer, articulation, put out feelers. let out, emit, tap out, pitch. register, fit out, clock, pace out, quantify, weigh, measure out. disciplinary, penal, lenient, mild, carry, exemplary. Narrows, field, channel, open water, neck, groundwater, ground. discord, lilt, drumroll, chord, drumming, mode, music, harmony, dissonance, crescendo. reverberation, strength, intensity, resonance, scratchiness, reediness, screechiness, pattern. body of water (noun)
lagoon, ocean, lake, pond, fiord, cove, gulf, reservoir, bay, ditch, inlet, bayou, estuary, tank, well, strait, pool, puddle.
firm (noun)
reliable.
sensible (noun)
prudent, judicious.
something heard or audible (noun)
pitch, reverberation, harmony, noise, resonance, voice, Sonance, music.
sound (noun)
profound, reasonable, substantial, reasoned, audio, speech sound, auditory sensation, acoustics, soundly, phone, healthy, well-grounded, talking, go, vocalise, sensible, complete, legal, levelheaded, wakeless, voice, stable, intelligent, secure, valid, noise, righteous, strait, deep, fathom, solid, dependable, heavy, good, safe, vocalize, strong.
trustworthy (noun)
loyal, true, faithful.

v.

complete (verb)
thorough, total, absolute.
give the impression (verb)
look, seem, appear.
perception (verb)
go.
produce noise (verb)
smash, jangle, moan, shriek, clink, bang, reverberate, slam, snort, whine, shout, roar, sing, clank, echo, vibrate, chatter, thump, bark, thud, whisper, cackle, babble, clatter, shrill, clang, reflect, emit, resound, jabber, rumble, trumpet, buzz, clap, crash, boom, jar, thunder, creak, blow, rattle, hum, play, detonate, murmur, blare, burst, explode, patter, clack.
sound (verb)
signal, cry out.

Other synonyms:

innocuous, earshot, thorough, total, utter, channel, incisive, avoidable, measure out, pace out, outright, patter, groundwater, controllable, in depth, Sonance, intellectual, unadulterated, quantify, ring out, preventable, disciplinary, flawless, penal, meditative, protective. normal, whole, exemplary, harmless, reliable, lenient, reflect, let out, prudent, sing, reverberation, clack, vibrate, open water, emit. hearing, thoughtful, resonance, tap out, balanced, pitch. true, weigh, intensity. clock. look, pattern, appear. gauge. seem. smart, measure. strength, register. show, field. ground. light. carry. blow
trumpet.
boom
blare.
buzz
hum.
gibber
jabber.
jingle
jangle.
matter of fact
practical.
peal
ring out.
resonate
resound.
resound
reverberate.
reverberate
resound.
seem
appear.
squeak
creak.
uninjured
unimpaired.
verbalize
verbalize.
well-advised
judicious.
Other relevant words:
probe, fathom, appear, judicious, faithful, secure, vocalize, Sonance, seem, resound, pronounce, solid, say, reliable, reflect, voice, articulation, reverberate, look, complete, valid, hearing, earshot, safe, speech sound, prudent, carry, whole, blow, strong, true, utter, normal, feel, dependable, stable, healthy, good, well-grounded, echo, plumb, substantial, phone.

Usage examples for sound

  1. It seems to me to sound like it. – Daisy in the Field by Elizabeth Wetherell
  2. Sense, sir; sound sense. – A Dash from Diamond City by George Manville Fenn
  3. You make no sound – The Untamed by Max Brand