Weightiness n. : The quality or state of being weighty; weight; force; importance; impressiveness.

Example:
As a high school student, what can I do to save the planet?

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Defination from the web:
weightiness in the Online Dictionary. Meaning of weightiness. Pronunciation of weightiness. Translations of weightiness. ... weightiness - the property of being comparatively great in weight; "the heaviness of lead" heaviness. weight - the vertical force exerted by a ...