indubitably

UK: /ɪnˈdjuːbɪtəblɪ/

Collins Concise English Dictionary © HarperCollins Publishers::

indubitably / ɪnˈdjuːbɪtəblɪ/ adverb

1. without doubt; certainly

WordReference Random House Learner's Dictionary of American English © 2026

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 © 2026

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.