Both words can express suitability, but 適当 also has a casual, negative sense.

The idea

適当な modifies a noun; 適当に modifies a verb. In formal contexts it can mean appropriate, as in an appropriate amount. ふさわしい directly modifies a noun or follows に: 役割にふさわしい means fitting for the role.

Patterns to compare
FormExample
適当てきとうな適当てきとうな量りょう
適当てきとうに適当てきとうに答こたえる
ふさわしい役割やくわりにふさわしい

Examples

  • 適当てきとうな量りょうの水みずを加くわえてください。Please add an appropriate amount of water.
  • 委員会いいんかいは適当てきとうな方法ほうほうを選えらびました。The committee chose an appropriate method.
  • 彼かれは質問しつもんを聞きかずに、適当てきとうに答こたえました。He answered carelessly without listening to the question.
  • 彼女かのじょはこの役割やくわりにふさわしいです。She is suited to this role.
  • 式しきにふさわしい服ふくを選えらんでください。Please choose clothes appropriate for the ceremony.
  • その発言はつげんは場ばにふさわしくありませんでした。That remark was not appropriate for the occasion.

Read-aloud uses a synthetic Japanese voice available on your device. Voice quality and availability vary; it does not assess your pronunciation.

Watch out

Do not assume 適当 always means careless: context determines the sense. For an unambiguous compliment about a person or occasion, ふさわしい is often clearer.

Try it yourself

  1. 水みずを適量てきりょうだけ加くわえます。__な量りょうの水みずを加くわえます。(適当てきとう/ふさわしい)

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    適当

    適当な describes an appropriate amount here, not a careless one.

  2. この役割やくわりに__人ひとを選えらびます。(適当てきとうな/ふさわしい)

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    ふさわしい

    ふさわしい expresses a fitting match for the role; に marks the standard.

  3. 質問しつもんを聞きかず、いいかげんに__答こたえました。(適当てきとうに/ふさわしく)

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    適当に

    適当に describes answering carelessly, without serious thought.

Use it today

Choose the form that matches each context, then describe a suitable candidate and a careless answer.