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1. Not redeemable for money in coin: inconvertible paper currency.
2. Not able to be legally exchanged for another currency.

in′con·vert′i·bil′i·ty, in′con·vert′i·ble·ness n.
in′con·vert′i·bly adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in periodicals archive ?
Quite the contrary: the historical and geological record both show inconvertibly that climate and weather patterns are in more or less constant flux, sometimes verging into drastic long-term shifts that create ice ages and warming epochs.
Priest, in a 2001 issue of Current Anthropology, has demonstrated inconvertibly that this is an urban legend.
The reward derived from that 100 percent effort is portrayed as negligible - i.e., it is inconvertibly itself, and cannot be transmuted into anything more useful.