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There are 5 thirteen-letter words beginning with INSI

INSIDIOUSNESSinsidiousness n. A surreptitious harmfulness, quality of entrapment, or treacherousness; the characteristic of being insidious.
INSIDIOUS n. developing or advancing gradually and imperceptibly.
INSIGNIFICANTinsignificant adj. Not significant; not important, inconsequential, or having no noticeable effect.
insignificant adj. Without meaning; not signifying anything.
INSIGNIFICANT adj. not significant.
INSINCERITIESinsincerities n. Plural of insincerity.
INSINCERITY n. the state of being insincere.
INSINUATINGLYinsinuatingly adv. In an insinuating way.
INSINUATING adv. INSINUATE, to hint or indirectly suggest.
INSIPIDNESSESINSIPIDNESS 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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