Related Clues:

• Faulty
• Not good, as ideas go
• Illogical
• Lame
• Apt to break
• Damaged
• Not healthy
• Flawed
• In poor condition
• Fallacious
• Unsafe or not well-grounded
• Defective or flawed
• Imperfect or untenable
• Not reliable, like some evidence
• Not strong or free from defect - perhaps evidence in court