Definition of "immatureness" [im•ma•ture•ness]

• The state or quality of being immature. (noun)

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• "It is true that for a few years after leaving the cradle he had exhibited a certain immatureness, but as soon as he put on knickerbockers and began to go about a little he outgrew all that."
• "Covent Garden, the child stepping blithely by my side, graceful even then, notwithstanding her immatureness, and quaintly attractive, though her deep blue eyes were full of tears, and the white terror had not passed wholly from her face."
• "Usui, cornered, needles Aoi of her immatureness of not actually knowing the meaning of what she's doing."