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 There are 2 words containing SIDIOUSN| 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. |  
 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: 3 words
 - Scrabble in French: no word
 - Scrabble in Spanish: no word
 - Scrabble in Italian: no word
 - Scrabble in German: no word
 - Scrabble in Romanian: no word
 
 
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