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There are 5 twelve-letter words beginning with SINI

SINISTERNESS	• sinisterness n. The state or condition of being sinister. • SINISTERNESS n. the state of being sinister.
SINISTERWISE	• sinisterwise adj. (Heraldry, archaic) sinister; on the left-hand side from the wearer’s viewpoint. • SINISTERWISE adv. in left-handed fashion.
SINISTRALITY	• sinistrality n. Left-handedness. • SINISTRALITY n. the state of being sinistral.
SINISTRORSAL	• sinistrorsal adj. Rising spirally from right to left (of the observer); sinistrorse. • SINISTRORSAL adj. of a climbing plant, rising helically and turning to the right.
SINISTROUSLY	• sinistrously adv. In a sinistrous manner; perversely; wrongly; unluckily. • sinistrously adv. With a tendency to use the left hand. • SINISTROUS adv. inauspicious, sinister, also SINISTER.

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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English Wiktionary: 13 words
Scrabble in French: 4 words
Scrabble in Spanish: 3 words
Scrabble in Italian: 22 words
Scrabble in German: no word
Scrabble in Romanian: 2 words

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