unrefundableadj.
/ˌʌnriːˈfʌndəbl/, /ˌʌnrᵻˈfʌndəbl/, /(ˌ)ʌnˈriːfʌndəbl/, U.S. /ˌənrəˈfəndəb(ə)l/, /ˌənriˈfəndəb(ə)l/ That cannot be refunded; non-refundable.rare before 20th cent.
ΚΠ
1783 Morning Herald & Daily Advertiser 12 Sept. 4/1 He signed the Bond in full confidence.., produced more than 300l. but at all events this sum was certain and unrefundable.
1917 Interpr. Accounting Classif. Express Companies (U.S. Interstate Commerce Comm.) Accounting Bull. No. 13. 16 This company is carrying as a liability a balance of unrefundable overcharges on shipments made prior to July 1, 1914.
1962 Times 27 Mar. 11/1 Law books are being studied here to see who is to gain control of about $3m. (more than £1m.) in unlawfully collected but largely unrefundable taxes.
2007 Ann. Amer. Acad. Polit. & Social Sci. 611 135 There may be an inclination to share when it would otherwise go to waste. This would apply to an unrefundable ticket to a performance that we cannot attend.
This is a new entry (OED Third Edition, December 2014; most recently modified version published online December 2021).
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adj.1783