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There are 5 thirteen-letter words beginning with INSI

INSIDIOUSNESS• insidiousness n. A surreptitious harmfulness, quality of entrapment, or treacherousness; the characteristic of being insidious.
• INSIDIOUS n. developing or advancing gradually and imperceptibly.
INSIGNIFICANT• insignificant adj. Not significant; not important, inconsequential, or having no noticeable effect.
• insignificant adj. Without meaning; not signifying anything.
• INSIGNIFICANT adj. not significant.
INSINCERITIES• insincerities n. Plural of insincerity.
• INSINCERITY n. the state of being insincere.
INSINUATINGLY• insinuatingly adv. In an insinuating way.
• INSINUATING adv. INSINUATE, to hint or indirectly suggest.
INSIPIDNESSES• INSIPIDNESS n. the state of being insipid, also INSIPIDITY.

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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