1. mistaken beliefs or false ideas, especially ones based on unsound reasoning
Usage: plural of fallacy
2. flawed arguments or reasoning that appear valid but contain logical errors
Usage: logic; rhetoric

Examples

• The debate was full of logical fallacies that weakened both sides’ arguments.
• Common fallacies include assuming correlation implies causation.
• The professor taught students to identify fallacies in political speeches.
• Many conspiracy theories are built on fundamental fallacies.
• Critical thinking helps people recognize fallacies in advertising.
• The book exposed several fallacies about nutrition and diet.
• Students learned to avoid fallacies when writing persuasive essays.