bad logic

• fallacyError in reasoning
• flawedHaving faults or imperfections
• reasoningDrawing logical conclusions
• illogicalContrary to valid reasoning
• faultyHaving defects or errors

sophistry · contradiction · nonsense · absurd · irrational · circular · strawman · misleading · unsound · spurious · invalid · specious · paradox · muddled · twisted · hole · leap · mental gymnastics