inconceivable

UK:^*^*UK and possibly other pronunciationsUK and possibly other pronunciations/ˌɪnkənˈsiːvəb^əl/

US:USA pronunciation: IPAUSA pronunciation: IPA/ˌɪnkənˈsivəbəl/

US:USA pronunciation: respellingUSA pronunciation: respelling(in′kən sē′və bəl)

in•con•ceiv•a•ble /ˌɪnkənˈsivəbəl/USA pronunciation adj.

that cannot be imagined:inconceivable distances.[it + be + ~ + that clause]It's inconceivable that we'll travel to distant galaxies.
incredible:inconceivable blunders.[it + be + ~ + that clause]It's inconceivable that these things should happen.

in•con•ceiv•ab•ly, adv.

in•con•ceiv•a•ble (in′kən sē′və bəl),USA pronunciation adj.

in′con•ceiv′a•bil′i•ty, in′con•ceiv′a•ble•ness, n.
in′con•ceiv′a•bly, adv.

Collins Concise English Dictionary © HarperCollins Publishers::

inconceivable /ˌɪnkənˈsiːvəb^əl/ adj

ˌinconˌceivaˈbility, ˌinconˈceivableness n ˌinconˈceivably adv

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