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Good/Bad vs. Well/Badly

What’s the difference between mau and mal? What about bom and bem? These pairs of Portuguese words are very similar in meaning, but they’re not interchangeable. It comes down to understanding the difference between adjectives and adverbs and how they are used in Portuguese.

Adjectives

Good and bad are adjectives, which modify nouns (people / places / things). In Portuguese, adjectives must agree with the noun in gender and number:
bomgood (masc. sing.) bonsgood (masc. plur.)
boagood (fem. sing.) boasgood (fem. plur.)
maubad (masc. sing.) mausbad (masc. plur.)
bad (fem. sing.) másbad (fem. plur.)

Adverbs

Well and badly are adverbs, which modify verbs, adjectives, and other adverbs. Adverbs are invariable, so the same words are used regardless of the gender and number of the noun.
bemwell
malbadly, poorly

Which One Do I Use?

Bom / Boa vs. Bem

Let’s look at these examples to illustrate the difference between bom/boa (adjectives) and bem (adverb).
Este telemóvel é bom. Funciona muito bem.This cell phone is good. It works very well.

Notice how bom (adjective) modifies telemóvel (noun), while bem (adverb) modifies funciona (verb).

Que boa menina, tão bem educada!What a good girl, so well-mannered!

Here, boa (feminine form of bom) is modifying menina (noun), while bem is modifying educada (adjective). The adverb bem could never be paired with the noun.

Correct:
Foi um bom concerto.It was a good concert.
Incorrect:
Foi um bem concerto.It was a well concert. (incorrect)

Mau / Má vs. Mal

Now let’s review the difference between mau/ (adjectives) and mal (adverb).
O café é mauThe coffee is bad
Eu conduzo malI drive poorly
Mau modifies the noun café, while mal modifies the verb conduzo.

Summary

If you’re not sure which of the pairs fit in a sentence, look at the surrounding words to see whether the word describes a noun, verb, adjective, or adverb.

  • For words that will modify a noun, use an adjective like bom or mau, adjusted to match the gender and number of the noun.
  • For words that will modify a verb, adjective, or adverb, use an adverb, like bem or mal.
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