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Definition of weightiness : The quality or state of being weighty; weight; force; importance; impressiveness.

Synonyms:

weighting, free weight, onerousness, burdensomeness, oppressiveness, massiveness, weight, seriousness, thickness, weight unit, momentousness, heavy, gravity, ponderosity, concern, ponderousness, significancy, important, significance, concernment, heftiness, moment, graveness, importance, system of weights, import, avoirdupois, exercising weight, heaviness, consequence

Usage examples:

• Frau Mahlmann was already aware that Bertha had ordered a costume from a dressmaker in Vienna on the previous day, and she began to discuss the matter with great weightiness. - "Bertha Garlan", Arthur Schnitzler.
• And the weightiness of these considerations is not diminished when we relate them to the special needs of the day. - "Nature Mysticism", J. Edward Mercer.