sinkable a capable of being sunk Usage(s) Price: $7,000, about $1,000 more than sinkable boats of similar design. Then, fortified by one of his own non-sinkable suits, he learns to dog-paddle in a bathtub. The Air Force said plainly that a sinkable (and tremendously expensive) 80,000-ton carrier represented a dubious investment. Antonym(s) unsinkable