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 There are 4 words containing NSIDIO| INSIDIOUS | • insidious adj. Producing harm in a stealthy, often gradual, manner. • insidious adj. Intending to entrap; alluring but harmful.
 • insidious adj. (Nonstandard) Treacherous.
 |  | INSIDIOUSLY | • insidiously adv. In an insidious manner. • INSIDIOUS adv. developing or advancing gradually and imperceptibly.
 |  | INSIDIOUSNESS | • insidiousness n. A surreptitious harmfulness, quality of entrapment, or treacherousness; the characteristic of being insidious. • INSIDIOUS n. developing or advancing gradually and imperceptibly.
 |  | INSIDIOUSNESSES | • insidiousnesses n. Plural of insidiousness. • INSIDIOUSNESS n. INSIDIOUS, developing or advancing gradually and imperceptibly.
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 Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.Definitions are short excerpt from the WikWik.org and 1Word.ws.
 
 See this list for:English Wiktionary: 5 wordsScrabble in French: no wordScrabble in Spanish: 6 wordsScrabble in Italian: 6 wordsScrabble in German: no wordScrabble in Romanian: 11 words
 
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