The quality or state of being chesty; either the prominence or development of the chest, or the state of being arrogantly confident.
From 'chesty' (adjective) with the noun-forming suffix '-ness,' which converts adjectives into abstract nouns describing their qualities. This is one of the most productive word-formation patterns in English.
'-Ness' is the most powerful suffix in English because you can add it to almost any adjective and create a noun for that quality—'chestiness' captures the whole concept of being puffed up or proud in a single, useful word.
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