Ill-advised (adjective)

Not well considered; unwise; not prudent.

Origin:

From the old english words 'ill' meaning 'bad' and 'advise' meaning 'suggestion', 'ill-advised' has been used in english language since 16th century.

Examples:

1. It was ill-advised to make a decision based on emotions rather than facts.
2. His friends warned him that the investment was ill-advised, but he went ahead with it anyway.
3. Her ill-advised comments on social media caused a public uproar.
4. The company's ill-advised business strategy led to its downfall.
5. The plan was considered ill-advised and was quickly scrapped.