Insidious

"Insidious" in Polish

podstępny

(causing harm in a stealthy, often gradual, manner)

zdradliwy

(causing harm in a stealthy, often gradual, manner)

zdradziecki

(causing harm in a stealthy, often gradual, manner)

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.