You will hear yourself get it wrong before anyone corrects you. English speakers reach for the spelling, see oi, and produce something like COIM-bra — two syllables, a hard English diphthong at the front, the stress at the start. It is a reasonable guess from the letters. It is not the word.
The Portuguese name has three syllables: Co-im-bra. The stress falls on the middle one. That middle syllable is nasal, the way sim is nasal in Portuguese, so the sound goes up into the nose rather than out through the mouth. And the final syllable is not “bra” as in brassiere; it is a soft, unstressed, almost swallowed “-bruh”.
Put together: coo-EEM-bruh. Say it slowly three times and the shape of it sticks, because the hard part is not the sounds. It is unlearning the assumption that the two vowels at the front belong together.
Why it is three syllables
English Wiktionary’s Portuguese entry syllabifies the word explicitly as Co-im-bra, and files it under the rhyme -ĩbɾɐ, tagged as a three-syllable rhyme. That is the whole argument, and it comes from a source that records the language rather than guessing at it.
Read the rhyme string slowly, because it carries three separate pieces of information. The tilde on the first vowel marks it nasal. The final vowel is /ɐ/, the reduced schwa-like sound that ends an enormous number of Portuguese words and that English speakers reliably over-pronounce. And the rhyme begins at the stressed syllable, which tells you where the emphasis lands: on -im-, in the middle.
The consequence is that Co- is its own small, unstressed syllable. It is not a launching pad for a diphthong. Think of it as the “coo” in cuckoo, said quickly and quietly, and then get on to the part that matters.
One honest limitation. Wiktionary generates its full phonetic transcription from a template rather than storing a printed string, so we are not reproducing an IPA transcription we could not read directly from the source. The syllabification and the rhyme are what the raw entry states, and they are enough to say the word correctly.
If you want to hear it rather than read about it, Wiktionary hosts a Portugal-accent audio file for the word. Thirty seconds with that is worth more than this paragraph.
The nasal vowel, for English speakers
The middle syllable is the one that makes people sound foreign, and it is worth two minutes of practice.
English has no phonemic nasal vowels. Portuguese has several, and they are not the same thing as saying a vowel followed by an “m” or an “n”. In Coimbra, the m is not a consonant you pronounce; it is a spelling convention marking the vowel before it as nasal. If you close your lips and hum an M in the middle of the word, you have added a sound that is not there.
Try it mechanically. Say the English word seem, then stop before your lips meet. Hold the vowel and let the sound run out through your nose instead of finishing it. That is roughly the vowel in the middle of Coimbra.
The Portuguese word sim — yes — is the same vowel and you will hear it forty times a day here, which makes it the easiest model available. Listen for it, then copy it.
The final -bra is the other half of sounding right. Portuguese unstressed final a is short and dark and almost disappears. English speakers tend to give it a full open vowel, which lands the stress in the wrong place and makes the word sound like it has two heavy beats instead of one.
Where the name came from
The etymology is a better story than most place-name etymologies, and it is directly useful if you are planning a day trip.
Coimbra descends from Latin Conimbriga. Conímbriga is the Roman town at what is now Condeixa-a-Velha, south of the modern city, and it is the best-preserved Roman town in Portugal. Wiktionary notes that the two words are doublets: the same original word, arriving into the language twice by different routes, once worn down by centuries of speech and once reintroduced in its Latin form.
The elements are, with appropriate caution, a people and a hillfort: the first possibly from the Conii, the second from Proto-Celtic *brigā, the hillfort element that also sits inside names like Brigantia.
Now the part that catches people out. Roman Coimbra was not called Conimbriga. It was called Aeminium. When Conímbriga declined, the name travelled north with the bishopric and attached itself to its neighbour. The parish history of the Sé Velha states it plainly: Coimbra has been an episcopal seat since the fifth century, succeeding neighbouring Conímbriga.
So the city you are standing in has a borrowed name, and the town it borrowed it from is a bus ride away with its mosaics still in the floor. The Conímbriga day trip guide covers how to get there, which is mostly a question of not missing the 17:55 bus back.
The other names you will mispronounce
Coimbra is the first hurdle and the smallest. Here are the ones that follow, with the same treatment.
Mondego, the river. Mon-DEH-goo. The final o in Portuguese is an “oo”, not an “oh”, which is the single most useful rule on this list because it applies to hundreds of words.
Sé, cathedral. One syllable, “seh”, with an open e. You will say it constantly: Sé Velha, the old one, and Sé Nova, the new one.
Joanina, the library. Zhoo-a-NEE-na. The Portuguese j is the soft sound in the middle of “measure”, never the English hard J. The same rule gets you through Jardim.
Quebra-Costas, the stepped lane up to the cathedral. KEH-bra KOSH-tash. Portuguese s at the end of a syllable or a word is a “sh”, which is why Portuguese sounds nothing like Spanish even where it looks similar on the page. It means Back-Breaker, and the name is accurate.
Leitão, the roast suckling pig. Lay-TOWNG, roughly, with the -ão nasal and gliding. It is the hardest sound in Portuguese for English speakers and the one worth practising, because you will want to order it. Note that it is a Bairrada dish rather than a Coimbra one.
Buçaco, the walled forest, and the reason to learn the cedilla: boo-SAH-koo. A ç is always a soft S, never a K, which is the whole point of the little hook under it. You will also see it spelled Bussaco, and both spellings are in use.
Tentúgal, where the pastry comes from: ten-TOO-gal, stress on the marked syllable, because that is what the acute accent is for. Portuguese accents are instructions about stress rather than decoration, and reading them saves you guessing.
Lousã, the mountain town: low-ZANG, roughly, with the same nasal glide as leitão. Conímbriga, the Roman town: kon-EEM-bree-ga, four syllables, stress marked on the second — and now you can hear the family resemblance to the name of the city you are standing in.
Queima das Fitas, the student festival. KAY-ma dash FEE-tash. Eight days in May that are large enough to close a World Heritage site.
Does it matter
Less than language-anxious travellers fear, and more than the “everyone speaks English” crowd will admit.
You will not be corrected, and nobody will be rude. Coimbra has hosted an international university since 1290 and a steady stream of visitors for longer than tourism has been a word; badly pronounced Portuguese is entirely unremarkable here.
But two things change when you get the name right. The first is practical. If you are asking for directions, buying a ticket, or telling a driver where you want to go, coo-EEM-bruh is understood instantly and COIM-bra takes a beat. On a station platform in a hurry, that beat is worth eliminating.
The second is smaller and better. Getting a name right is the cheapest possible signal that you have paid attention to the place you are in. It costs one minute of practice and it is noticed, the way it is noticed anywhere.
Beyond that, a handful of words will carry you a long way. Bom dia, boa tarde, por favor, obrigado if you are male and obrigada if you are female — that last agreement catches people out, because it matches the speaker, not the person being thanked. And um café, por favor, which gets you an espresso, standing at a counter, for less than you would pay sitting down.