Basing a conclusion on evidence that supports the denial of the conclusion
Basing a conclusion on contradictory premises
Circular Reasoning
Concluding that a statement is false because undesirable consequences would occur if it were true
Generalizing from a sample that may be unrepresentative
Generalizing from two extremes while ignoring the middle ground
Ignoring counterevidence
Illegitimate appeal to authority
Questionable Analogy
Unfairly redefining a key term
Overgeneralization