Definition of unquantifiable
: not capable of being quantified : lacking a characteristic that can be measured or expressed as a number or amount <Travel, then, is the thing that can never be done badly, where even a failed effort brings unquantifiable rewards. — John Krich>
unquantifiablyplay \ˌən-ˌkwän-tə-ˈfī-ə-blē\ adverb
First Known Use of unquantifiable
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