Webster's 1828 Dictionary
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INSID'IOUS, adjective [Latin insidiosus, from insideo, to lie in wait; in and sedeo, to sit.]
1. Properly, lying in wait; hence, watching an opportunity to insnare or entrap; deceitful; sly; treacherous; used of persons.
2. Intended to entrap; as insidious arts.
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29317Mnemonics
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