wrong way traffic sign on blue sky

incorrect improper inaccurate mistaken erroneous flawed faulty unsound misguided misleading misinterpreted misunderstood misconstrued confused miscalculated misjudged illadvised illinformed illconceived wrongful inappropriate unwise unfortunate unintentional unfavorable inadvisable counterproductive undesirable disastrous harmful damaging risky unsafe hazardous perilous treacherous deceptive tricky deceitful destructive ruinous catastrophic regrettable adverse negative