adjective
1. poorly conceived or thought out (Freq. 1)
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an ill-conceived plan to take over the company
• Syn: ↑ill-conceived
• Similar to: ↑foolish
2. wrong in e.g. opinion or judgment
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well-meaning but misguided teachers
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a mistaken belief
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mistaken identity
• Syn: ↑mistaken
• Similar to: ↑wrong
Useful english dictionary. 2012.