Artificial intelligent assistant

unchargeable

unˈchargeable, a.
  (un-1 7 b.)

1649 Jer. Taylor Gt. Exemp. ii. x. 136 Offer was made of private and unchargeable arbitrators. 1659 Gentl. Calling ix. §8 Will any man renounce a rich unchargeable reversion, when he is not only wooed, but bribed..not to disclaim it?

Oxford English Dictionary

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