São Acentuadas As Palavras Paroxítonas Terminadas Em

Accenting Paroxytone Words in Portuguese: The Rules You Actually Need

The Portuguese accentuation system for paroxytones is simpler than most textbooks make it sound, but there are a few corners where even experienced writers trip up. I'll walk through what matters, and skip the rest.

são acentuadas as palavras paroxítonas terminadas em

a, e, o + s, l, n, r, x, plus diphthongs like em, ens. That's the core list. Everything else goes unmarked. I used to stress these with markers when I was editing, then just stopped—because the pattern itself is predictable once you memorize the suffix set. Now I read a word, figure out where the stress lands, check the ending, and move on. About ten seconds per word, maybe less if it's obvious. Here's where people get stuck. The letters n and r at the end of a paroxytone are common triggers, but only when they appear as the final consonant. Words like hipódromo, fácil, jovem, álbum—these all carry the accent because they follow the pattern. Álbuns (plural) keeps it too, since s is one of the marked endings.

I ran into a specific edge case once: the word índex. It looks like it should be unaccented because it ends in x, but that x sits after a stressed e that forms part of the nucleus. The rule says paroxytones ending in x are accented, and this word fits—ín-dex, stress on ín. Some style guides dropped the accent over time, and now you see both índex and index floating around. My rule of thumb: if a style guide allows the unaccented form, use it. If you're writing formally, stick with the accent. Either way, the stress doesn't change. Another thing worth noting: ditongos abertos (open diphthongs) éi, ói, ém, éns. These are the tricky ones. Herói, jibóia, parabéns, coração—the open vowel sound carries the accent, not the consonant ending. This is the one area where the rule doesn't neatly follow the consonant list I laid out above. The diphthong itself is the trigger.

There's a practical shortcut if you're unsure whether a word is paroxytone or oxytone. Read it slowly. Tap the stressed syllable. If it's the second-to-last syllable, you're dealing with a paroxytone, and now you just check the ending against the list. Cadáver—tap cá-da-Ver? No, that's wrong. It's ca-DÁ-ver, paroxytone, ends in r, so it gets the accent: cadáver. Ultrassom—ul-tra-SOM, oxytone, ends in m, no accent needed because the rule only applies to paroxytones ending in the specific set. One more pitfall: próton, nêutron, bóson. These end in n and are paroxytones, so they're accented. But átomo also ends in m and is paroxytone, yet m isn't in the marked list, so no accent. The asymmetry is real, not a typo in the rulebook.

If you want a reference, the Acordo Ortográfico de 1990 is the current standard for Portuguese-speaking countries, though Brazilian Portuguese implementations vary slightly from European norms. Most dictionaries online will flag whether a form follows the new agreement. When in doubt, consult one rather than guessing—especially for words that could be either oxytone or paroxytone depending on dialect. The whole system takes about five minutes to internalize, and then it becomes automatic. The trick isn't memorizing exceptions—it's recognizing that the exceptions themselves follow their own small logic, and that logic is usually about preserving the stress marker where ambiguity would otherwise creep in.