What's a better word for "confirm"?

SUBSTANTIATE

Definition:

To provide evidence to support or prove the truth of.

Synonyms: 

Affirm, Justify, Support

Antonyms: 

Disprove, Negate, Refute

Examples:

  • He tried to substantiate his excuse for being late, but 'alien abduction' lacked convincing evidence.

  • She claimed she was an expert in chess, but her losses to a beginner failed to substantiate that claim.

Etymology:

From Latin substantiare ('to give substance to'), based on substantia ('substance').

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