Not convertible; that cannot be exchanged for an equivalent(adjective)
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Use "nonconvertible" in a sentence
"Wednesday's proposal would strike the credit-ratings criteria and replace it with a new standard requiring a company to have issued more than $1 billion of nonconvertible debt securities in primary offerings within the past three years."
"At the time of convertible issuance, many REITs benefited from relatively low interest rates that were between 1.5 percentage points and 2.0 points below what companies would be able to issue for nonconvertible secured debt, said Mr. Marks, the analyst at Fitch."
"It attracted immense sums of foreign investment capital, and with its currency nonconvertible, it accumulated ever-larger reserves."