indubitable

UK: /ɪnˈdjuːbɪtəb^əl/

US: /ɪnˈdubɪtəbəl, -ˈdju-/

US: (in do̅o̅′bi tə bəl, -dyo̅o̅′-)

WordReference Random House Learner's Dictionary of American English © 2025

in•du•bi•ta•ble /ɪnˈdubɪtəbəl, -ˈdyu-/   adj. 

1. not to be doubted;
   unquestionable:
   indubitable sincerity.

in•du•bi•ta•bly, adv.: 

indubitably correct.

WordReference Random House Unabridged Dictionary of American English © 2025

in•du•bi•ta•ble  (in do̅o̅′bi tə bəl, -dyo̅o̅′-), adj. 

1. that cannot be doubted;
   patently evident or certain;
   unquestionable.

• Latin indubitābilis. See in-³, dubitable
• 1615–25

in•du′bi•ta•bil′i•ty, in•du′bi•ta•ble•ness, n. 
in•du′bi•ta•bly, adv. 

Collins Concise English Dictionary © HarperCollins Publishers::

indubitable / ɪnˈdjuːbɪtəb^əl/ adjective

1. incapable of being doubted; unquestionable

Etymology: 18th Century: from Latin indubitābilis, from in-¹ + dubitāre to doubt