CEFR C2

substantively

adverb

Meaning

In a manner that relates to the essential nature, core content, or significant importance of something.

The two versions of the contract differ substantively on the issue of liability.
We need to address the problem substantively rather than just focusing on cosmetic changes.

Synonyms: really, basically, significantly, essentially

adverb

Pronunciation: /səbˈstænʃəvli/

In a manner that relates to the essential nature, core content, or significant importance of something.

The two versions of the contract differ substantively on the issue of liability.
We need to address the problem substantively rather than just focusing on cosmetic changes.
The new evidence substantively supports the defendant's claim of innocence.

differ substantively (collocation): to be fundamentally different in content — "The two reports differ substantively in their conclusions."
substantively address (collocation): to deal with the core of an issue — "The government failed to substantively address the root causes of the crisis."

Words with a similar meaning to substantively: