What is a plain-English definition, including example, of a claim
considered "Contingent" in bankruptcy?

Similarly, how about a claim considered "Unliquidated" ?

Thank you

Hi! Thanks for the question. 

Here are the definitions for each of them.

Contingency Claim - "A claim that may be owed by the debtor under
certain circumstances, for example, where the debtor is a cosigner on
another person’s loan and that person fails to pay."
http://www.filing-bankruptcy-form.com/bankruptcy-terms.html#25

Unliquidated Claim - "A claim for which a specific value has not been
determined."
http://www.filing-bankruptcy-form.com/bankruptcy-terms.html#78

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