To be more specific I would say that confirmation is a much more accurate antonym for denial.
I would say denial or veto.
Stranger.
enemy, foe, stranger
neighbor
If the word FAMILY is used as adjectival predicate ("You are a family to me"), then the opposite would be STRANGER ("You are a stranger to me"). WHAT?
Depending on the specific definition of channel, an antonym for this word could be denial.
There is no antonym for testimony. One cannot prove wrong a person's belief of what they think is true, or their testimony of truth. However, testimony is a synonym for "admissions", (to admit to knowing). The antonym for admissions is "denial", which means to have no testimony of a belief or truth.
Denial of materialism
Denial - outright rejection. --- Note that denial is also used in the sense of dogmatic refusal to believe (something). Well known examples include Holocaust denial and climate change denial.
fearless, love, inclusive, tolerant, secure, confidentConsider also: xenophiliaFrom the Greek words ξένος (xenos), meaning "stranger," "foreigner," and "philia" (φιλία) (love, attraction).
He was denial of women rights. He was in denial of his committed bad deeds. He committed the act even though of his continuous denial.
denial clause