noun
the quality of being strong or robust
adjective
sturdy (related to sturdiness)
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The sturdiness of the bridge was tested by engineers before opening it to the public.
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I was impressed by the sturdiness of the new furniture we bought for the living room.
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That old car may not look like much, but it's got some serious sturdiness to it.
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Her mental sturdiness helped her navigate through the tough times with grace.