Superlative form of sound: most sound. (adjective)
Second-person singular present simple form of sound (verb)
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Use "soundest" in a sentence
"World Economic Forum, Canada has the "soundest" banking system in the world."
"Flaherty said in an interview that Canadian banks could be in the a position to extend their own equity share of the U.S. banking sector because, in contrast to their now-troubled U.S. counterparts, lending criteria in Canada had been more conservative, resulting in them being called the world's "soundest" by World Economic Forum last week."
""Rogers likes the Canadian dollar, one of the 'soundest' currencies, whose fate is closely tied to commodities."