Mal vs. Mau in Portuguese: Tell the Adverb from the Adjective — Practice

Use mau to describe a noun

Mau is an adjective meaning bad or unpleasant. It agrees with the noun: mau, má, maus, or más.

If you can replace the word with bom or boa (good), mau or má is usually the matching form.

Use mal to describe an action or state

Mal often works as an adverb and means badly or poorly. It can also appear in expressions such as passar mal (to feel unwell).

If the sentence describes how someone did something, mal is often the form you need. If it describes the noun itself, use the adjective mau or má.

Use a quick substitution check

Try replacing mal with bem (well) or mau with bom (good). The opposite often reveals whether you need an adverb or an adjective.

The check is a learning shortcut, not a substitute for meaning. Memorize common expressions as a whole phrase.

Remember: For each sentence, ask whether the word describes a noun (mau/má) or how something happens (mal).

Check your understanding

Choose the English meaning of each Portuguese example. Answer before looking back at the tables. These questions check the written examples in this guide; they are not a listening or proficiency test.

Recall the Portuguese, then say it

Read the English prompt and say a Portuguese version before opening the answer. The answer shows the example from the lesson; other natural translations may also work. Compare the meaning and the situation rather than counting a different word as automatically wrong.

1. It was a bad moment to talk.

   Show a Portuguese answer

   Foi um mau momento para conversar.

2. She had a bad impression of the place.

   Show a Portuguese answer

   Ela teve uma má impressão do lugar.

3. They aren’t bad professionals.

   Show a Portuguese answer

   Eles não são maus profissionais.

4. I slept badly last night.

   Show a Portuguese answer

   Dormi mal ontem.

5. The printer is working poorly.

   Show a Portuguese answer

   A impressora está funcionando mal.

6. He felt unwell after the trip.

   Show a Portuguese answer

   Ele passou mal depois da viagem.

Make the phrase useful to you

Choose one example you could actually use. Say it once from memory, then change one detail that fits your life, such as the person, place, time, or object. Check whether your change also needs a different verb form, article, or adjective ending. If it does, compare it with the pattern in the explanation.

For each sentence, ask whether the word describes a noun (mau/má) or how something happens (mal).

Return to two prompts tomorrow without opening the answers first. If a phrase still feels difficult, shorten it to a useful chunk and build the complete sentence again.

Sources and your next lesson

This I Speak Portuguese practice guide builds on our Mal vs. Mau in Portuguese: Tell the Adverb from the Adjective lesson on Real Life Portuguese, with written recall tasks and additional speaking practice. The explanations and examples are teaching material; the practice questions are exercises, not a transcript of a recording.

To add Brazilian audio to your routine, choose a lesson in the Real Life Portuguese app. The app offers its own lessons and practice; this page does not imply that every example here has an app recording.