How to spell UNSPRENG correctly?

"Unspreng" appears to be a misspelling and there are several possible suggestions for the correct spelling. It could be "unsprung", which means not having a spring or not having a spring mechanism or "unsparing", which means not holding back or being harsh and critical. Another possible suggestion could be "unsprung", which refers to a vehicle that does not have suspension.

• Unsparing She was unsparing in her criticism of the new policy.
• Unspent The unspent funds will be returned to the donor at the end of the fiscal year.
• Unstrung He was unstrung after losing the championship game.

Excatally

• exact
• exacted
• exactingly
• exactly
• exacts
• executable
• exotically
• extol
• inexactly
• oxtail