The quality or state of being full of expense; costliness.
Combines 'expenseful' with the noun-forming suffix '-ness' (Old English '-nes'), which creates abstract nouns from adjectives. This pattern has been productive in English for over a thousand years.
English loves taking simple ideas and wrapping them in multiple suffixes—'expense' becomes 'expenseful' becomes 'expensefulness,' like building noun pyramids! Yet we rarely use these stacked forms because they sound awkward compared to just saying 'cost.'
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