Pseudological is an adjective that describes arguments or statements that appear to be valid but are actually based on false or incorrect reasoning. Some synonyms for this word include fallacious, deceptive, misleading, specious, and unfounded. Fallacious suggests deliberate dishonesty or deception, while deceptive and misleading both imply an intent to mislead or misdirect. Specious suggests an argument that appears to be based on logic or reason, but is actually false. Unfounded implies that an argument is without any factual basis or evidence to support it. These synonyms all convey the idea of something that is not true or valid, and caution the listener or reader to be wary of such arguments.