It was an ill-conceived idea. I don't know why you thought you could pull it off.
Source: tatoeba (8777334)
Ranked by relevance and common usage.
Keep "ill-conceived" when the sentence already sounds natural, when a synonym would add unintended emphasis, or when readers need the most familiar wording. A synonym should clarify or sharpen the message, not simply make the sentence look more varied.
If two options seem close, choose the one that best matches the audience and purpose of the sentence.
Choose a synonym only if it keeps the core idea of "ill-conceived" intact in the sentence you are editing.
Check whether the replacement sounds more formal, casual, emotional, technical, or forceful than the original word.
Read the full sentence after the swap. Keep the synonym only when the sentence becomes clearer or more precise.
Review note: Synonym lists are ranked with lexical data and reviewed for practical writing value. Use the comparison notes, sentence evidence, and source labels together; a high-ranking synonym can still be wrong when the audience, register, or grammar changes.
After choosing a replacement for "ill-conceived", read the sentence once for meaning and once for rhythm. The best synonym should feel natural in the full sentence, not only accurate in a word list.
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2 total sentences available.
It was an ill-conceived idea. I don't know why you thought you could pull it off.
Source: tatoeba (8777334)
Elegant brick and stone buildings, with iron and glass canopies and decorative wooden scalloping and fencing—all evidencing care on the part of the architect to produce a pleasing, well-planned building—were submerged beneath a profusion of ill-conceived additions and camouflaged by vulgar paint schemes; and the original conception was lost.
Source: wiktionary
Closest matches include evil looking, evil minded, ill-favored, ill-gotten, misbegotten.
Compare the replacement against real sentence context. This entry includes sample sentences so you can check tone, grammar, and meaning before swapping words.