The quality or state of being chancy; the degree of risk, uncertainty, or luck involved in something.
From chancy + -ness (noun suffix creating abstract nouns); converts an adjective into a noun expressing the abstract quality of being chancey or risky.
The -ness suffix is one of English's most powerful tools—chanciness lets us turn any quality into a measurable noun, so we can discuss 'the chanciness of the plan'!
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