unobservable

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adjective un·ob·serv·able \ˌən-əb-ˈzər-və-bəl\

Definition of unobservable

  1. :  incapable of being observed :  not observable particles so small that they are unobservable

1615

First Known Use of unobservable

1615


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WORD OF THE DAY

feeling or affected by lethargy

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