The property of a watercraft that makes it fit to go to sea.(noun)
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Use "seaworthiness" in a sentence
"A number of concerns have been raised about the seaworthiness of the Rena."
"The biblical account of the Flood describes a vessel with ideal measurements for seaworthiness: not too big to build, not too small to transport all the animals required, half submerged in the water so that the wind had little effect on it, and impossible to capsize."
"Such as if a seaman in injured aboard a United States (and some US contracted) vessels the United States is responsible for all claims (maintenance and cure, seaworthiness, negligence, etc.) from that injury regardless of whether the vessel is operated by a private contractor or charterer."