Ill-considered
Else clues• Apt to turn out badly
• Foolhardy
• Foolish
• Hardly recommended
• Hardly well-considered
• Ill-advised
• Imprudent
• Lacking prudence
• Misguided
• None too savvy
• Not very well thought-out
• Poorly thought out
• Pound-foolish
• Rash, perhaps
• Stupid