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Word: insidious
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Meaning:
Adjective:
- Intending to entrap.
- medicine Describing a disease which worsens with few or no symptoms to signal its gravity.
- medicine Describing a disease with subtle or gradual onset. Patients with insidious diseases oftentimes cannot point out a time when the symptoms began.
- Producing serious harm in a stealthy, often gradual, manner.
- Treacherous.
Source: Wiktionary
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