No longer accept something as true.

Disregard prior faith in a belief.

Reject the validity of previous notions.

Abandon trust in previously held convictions.

Cease to have confidence in assertions made.

Not accepted as true or valid.

Disregarded due to skepticism or doubt.

Unacknowledged in terms of credibility.

Lacking trustworthiness in claims made.

Viewed with suspicion and disbelief by others.