Antonyms for the word "declares true" would be words or phrases that suggest falsehood or insincerity. Some possible antonyms could include "denies," "disputes," "rejects," "opposes," "contradicts," or "falsifies." These words suggest that the statement being made is untrue or deceptive, indicating a lack of trustworthiness in the speaker or their words. Alternatively, synonyms for "declares true" might include "affirms," "attests," "proclaims," or "verifies," which suggest a strong belief in the validity of a statement or claim. Antonyms and synonyms are important tools for understanding the nuances of language and the shades of meaning that can be expressed through different words.