Moving or acting quietly and carefully so as not to be noticed or detected.
From 'stealth' (from Old Norse 'stelth,' meaning theft or secrecy) + '-ily' (adverb suffix). The word originally had criminal connotations before becoming more neutral in meaning.
Stealthily is how predators hunt, soldiers move, and ninjas fight—it's such a fundamental survival behavior that the word appears in almost every language, though each one evolves from different roots!
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