Upper-Intermediate (B2)
IPA: /ɪnˈdjuːbɪtəblnəs/
KK: /ɪnˌdjuːbɪtəblnəs/
Definition
The condition of being certain or unquestionable; something that cannot be doubted.
Example
The indubitableness of her talent was recognized by everyone in the room.
Conversation

Did you hear about the debate last night?

Yeah, it was interesting! The speaker had such indubitableness in his arguments.

I know! It made everything he said so convincing.

Exactly, confidence like that really sways the audience.
Synonyms & Antonyms
Synonyms
certainty
assurance
conviction
Antonyms
doubt
uncertainty
disbelief
Root Explanation
Indubitableness → It is formed from "in-" (meaning not), "dubitare" (meaning to doubt), and "-ness" (meaning the state of). The word refers to the state of being not doubted or unquestionable.
Memory Tip
Think of being in a state of certainty where there is 'no doubt' ('in-' means not, and 'dubitare' means to doubt).
Visually Confused Words
undoubtableness
inequitableness
indomitableness
indisputableness
vindicableness
inimitableness
inevitableness
suitableness