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There are 4 words beginning with INSIDIOU

INSIDIOUSinsidious adj. Producing harm in a stealthy, often gradual, manner.
insidious adj. Intending to entrap; alluring but harmful.
insidious adj. (Nonstandard) Treacherous.
INSIDIOUSLYinsidiously adv. In an insidious manner.
INSIDIOUS adv. developing or advancing gradually and imperceptibly.
INSIDIOUSNESSinsidiousness n. A surreptitious harmfulness, quality of entrapment, or treacherousness; the characteristic of being insidious.
INSIDIOUS n. developing or advancing gradually and imperceptibly.
INSIDIOUSNESSESinsidiousnesses 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.

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See this list for:

  • English Wiktionary: 4 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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