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REFERENCE

foolish

adj.
US //ˈfuɫɪʃ// UK //fˈuːlɪʃ// fool·ish
  1. 1 unwise or lacking judgement (adj.)
    B1 Intermediate

    acting without good sense or making a choice that is not smart.

    demonstrating a lack of good judgement or prudence; often used to describe specific actions or decisions that lead to negative consequences.

    Example

    It would be foolish to go outside in the storm without a coat.

    Example

    The investors realized too late that it was foolish to commit so much capital to a project with no clear path to profitability.

    Pitfall
    It was foolish from him to leave.
    It was foolish of him to leave.

    When describing a person's character through their action, use 'of' followed by the person.

  2. 2 ridiculous or like a fool (adj.)
    B2 Upper Intermediate

    looking or acting silly in a way that makes people laugh or feel embarrassed.

    resembling or characteristic of a fool; often used when someone feels embarrassed or looks ridiculous to others.

    Example

    He felt foolish when he realized he was wearing two different shoes.

    Example

    She felt incredibly foolish standing on the stage after forgetting the opening lines of her presentation.

Origin

From Middle English folisch; equivalent to fool + -ish.

Word family
Idioms1 entry

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