Superlative form of stealthy: most stealthy.(adjective)
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Use "stealthiest" in a sentence
"An eye-witness said the sub - described as the stealthiest ever built in the UK - appeared to have grounded on rocks."
"Now a new code, or algorithm, created by Penn State researchers targets the "stealthiest" of these worms, containing them before an outbreak can occur."
""stealthiest" of these worms, containing them before an outbreak can occur."