Italian

insidioso

adj

Che presenta pericoli nascosti o difficili da riconoscere; che agisce in modo subdolo o ingannevole.

English: dangerous, insidious, tricky, underhand

È un nemico insidioso, difficile da riconoscere. — It is an insidious enemy that is difficult to recognize.
La malattia è insidiosa e progredisce senza sintomi evidenti. — The disease is insidious and progresses without obvious symptoms.

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