How do you spell Insignificant

Available Definitions:
1)  a. - Not significant; void of signification, sense, or import; meaningless; as, insignificant words.
2)  a. - Having no weight or effect; answering no purpose; unimportant; valueless; futile.
3)  a. - Without weight of character or social standing; mean; contemptible; as, an insignificant person.