"soundest" in the adjective sense

1. sound

financially secure and safe

"sound investments"

"a sound economy"

2. healthy, intelligent, levelheaded, level-headed, sound

exercising or showing good judgment

"healthy scepticism"

"a healthy fear of rattlesnakes"

"the healthy attitude of French laws"

"healthy relations between labor and management"

"an intelligent solution"

"a sound approach to the problem"

"sound advice"

"no sound explanation for his decision"

3. sound

in good condition free from defect or damage or decay

"a sound timber"

"the wall is sound"

"a sound foundation"

4. good, sound

in excellent physical condition

"good teeth"

"I still have one good leg"

"a sound mind in a sound body"

5. reasoned, sound, well-grounded

logically valid

"a sound argument"

6. legal, sound, effectual

having legal efficacy or force

"a sound title to the property"

7. sound

vigorous or severe

"a sound thrashing"

8. sound

free from moral defect

"a man of sound character"

9. heavy, profound, sound, wakeless

of sleep) deep and complete

"a heavy sleep"

"fell into a profound sleep"

"a sound sleeper"

"deep wakeless sleep"

10. sound

complete thorough

"politicians have no sound grasp of technology issues"

"he has a sound understanding of the law"

Source: WordNet® (An amazing lexical database of English)

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