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Insignificant is the correct spelling.
insignificant=umimportant
Such things are insignificant details compared to the main goal.
Omit the insignificant details.
He felt very insignificant next to the president of the student council.
That is an insignificant fact. His contribution was insignificant.
My doll is insignificant but my famliy is not.
The worn out book was insignificant.