The antonyms for the phrase "rings phony" are words that convey authenticity, genuineness, or legitimacy. These words include "authentic," "genuine," "real," "trustworthy," "honest," "credible," "dependable," and "true." These terms suggest a sense of truth, reliability, and honesty that stands in opposition to anything that might be considered "phony." In the context of a person or a product, these terms suggest that something is sincere and true to its nature, rather than trying to disguise or deceive through manipulation or false pretenses.