The quality or state of being heavy, substantial, or hefty.
Noun of quality formed from 'hefty' plus the -ness suffix, which is English's most productive way of turning adjectives into abstract nouns representing qualities.
The -ness suffix is one of English's greatest tools for abstraction—it lets us turn 'hefty' (an observable quality) into 'heftiness' (a concept we can discuss and analyze), which is how language lets us think about thoughts.
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