OE and Other Vowel Digraphs | Dutch Grammar

After the front rounded uu/eu and the three core diphthongs, a handful of vowel spellings remain — and they're the friendliest group, because one of them is a sound English already has. This page covers oe (boek, goed), the glide sequences aai/ooi/oei/eeuw/ieuw (mooi, nieuw, leeuw), and the two endings -ig and -lijk (gelukkig, eindelijk) that reduce to something quite unlike their spelling. The core diphthongs ui, ij/ei, au/ou are in the diphthongs; the front rounded uu and eu are in front rounded vowels.

OE — the one digraph you already own

oe is the English "oo" of food — a back, fully rounded long vowel, the [u] sound. boek rhymes with English book only if your book uses the long "oo" (many English speakers say it short); the safe anchor is food, moon, boot. This is the single Dutch vowel digraph that English speakers map correctly on instinct, so enjoy it. Just keep it a pure, steady monophthong — don't let it glide.

boek

'book' — oe = the 'oo' of 'food'; 'book' with a long oo, not the short English book vowel.

moeder

'mother' — oe in the first syllable, long and steady: 'MOO-der'.

goed

'good' — oe = 'oo'; 'goot' (the final d devoices to t). Not 'good' with the English short vowel.

The one thing to guard against is the English habit of reading oe as something else entirely. In English, the letters oe spell "oh" in toe / foe, and "uh"/"ee" in does / amoeba. In Dutch, oe is always the "oo" of food. There's no variation.

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oe is the easy one: it's the "oo" of food, every time, with no exceptions. Don't import the English readings of the letters oe (the "oh" of toe, the "uh" of does) — Dutch never uses them.

Vowel + glide: aai, ooi, oei, eeuw, ieuw

A long vowel followed by a j-glide (-i in spelling) or a w-glide produces these sequences. They feel like triphthongs but are best thought of as a long vowel plus a glide consonant: hold the vowel, then add a quick y or w at the end.

Spelling	= vowel + glide	Word	Meaning
aai	aa + j	haai, draai	shark, turn
ooi	oo + j	mooi, gooi	beautiful, throw
oei	oe + j	koei(en), groei	cow(s), growth
eeuw	ee + w	leeuw, eeuw, sneeuw	lion, century, snow
ieuw	ie + w	nieuw, kieuw	new, gill

The key is that the vowel keeps its full quality and the glide is light and quick — mooi is oo + a short y, not a separate "oh-ee" with two beats. Likewise nieuw is ie (the long "ee") + a short w-glide, landing close to "nee- oo" said fast.

mooi

'beautiful' — oo + a quick y-glide; one syllable, not 'mo-wee'.

nieuw

'new' — ie ('ee') + w-glide; 'nee-oo' said as one beat, not 'new'.

eeuw

'century' — ee + w-glide; a long 'ay'-ish vowel rolling into a w.

groei

'growth' — oei = oe + a quick y-glide; one syllable, the same vowel as in koeien ('cows').

A spelling note: nieuw loses nothing when inflected — the adjective adds -e to give nieuwe (nieu-we), and the w that was final now starts the next syllable. The same pattern holds for -eeuw words: leeuw → leeuwen ("lions"), sneeuw → sneeuwen ("to snow"). Keep the doubled vowel: it's -eeuw and -ieuw, never "-euw" or "-iew".

nieuw / nieuwe

'new' / 'new' (inflected) — the w moves to the next syllable: nieu-we.

The endings -ig and -lijk reduce to schwa

Two extremely common adjective/adverb endings are not pronounced the way they're written, because the unstressed vowel reduces to a schwa (see schwa and reduction):

-ig (gelukkig, gezellig, twintig) is pronounced roughly "-uhch" — a schwa plus the soft Dutch g. The i is not the "ih" of pit; it's reduced. In careful or southern speech you may hear a fuller vowel, but normal northern speech reduces it.
-lijk (eindelijk, moeilijk, waarschijnlijk) is pronounced "-luhk" — a schwa between the l and k. The ij, which would be a diphthong anywhere else, completely reduces here. It is not "-like" and not "-lyke".

gezellig

'cosy/sociable' — the prized untranslatable word; -ig sounds like 'uhch', so 'khe-ZEL-luhch'.

waarschijnlijk

'probably' — note: the first -ij- (-schijn-) is a full diphthong, but the ending -lijk reduces to 'luhk': 'vaar-SCHEIN-luhk'.

gelukkig

'happy/fortunately' — -ig → 'uhch'; 'khe-LUK-uhch'.

moeilijk

'difficult' — oei glide + reduced -lijk: 'MOOY-luhk', not 'moy-like'.

Notice waarschijnlijk: the word contains ij twice, and the two are pronounced differently. The stressed -schijn- keeps the full ij diphthong; the unstressed ending -lijk reduces it to schwa. That contrast is the whole point — ij is a strong diphthong under stress and a weak schwa when unstressed.

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Whenever you see -ig or -lijk at the end of a word, stop reading the letters and reach for a schwa: "-uhch" and "-luhk". These two endings cover a huge share of Dutch adjectives and adverbs, so getting them reduced fixes your accent across thousands of words at once.

The -lijk / "-ly" false friend

Here's the insight visual-learners get burned by: Dutch -lijk is the historical cognate of English -ly. Eindelijk ≈ "final-ly", moeilijk relates to "toil/moil"-ly. Because they're cognates and look similar, English speakers instinctively read -lijk as "-like" or "-lyke" — pronouncing the ij as a full diphthong. But spoken Dutch reduces it to plain "luhk". The visual cognate actively misleads the ear: the more "obvious" the spelling looks, the wronger your guess. Train yourself to say "luhk" the moment you see -lijk.

eindelijk

'finally' — cognate of '-ly' but said 'EIN-duh-luhk', never 'eind-uh-like'.

Common Mistakes

❌ boek pronounced like English 'boke' or with the 'oh' of 'toe'

Wrong — Dutch oe is always the 'oo' of 'food'.

✅ boek (the 'oo' of 'food')

'book'.

❌ goed pronounced with the short English 'good' vowel

Wrong — oe is the LONG 'oo'; goed = 'goot'.

✅ goed (long oo, final d devoiced)

'good'.

❌ -lijk pronounced 'like' / 'lyke', reading the ij as a diphthong

Wrong — the unstressed -lijk ending reduces to 'luhk'.

✅ moeilijk ('MOOY-luhk')

'difficult'.

❌ -ig pronounced with a clear 'ih', like 'gelukk-ig'

Wrong — unstressed -ig reduces to 'uhch' in normal speech.

✅ gelukkig ('khe-LUK-uhch')

'happy/fortunately'.

❌ Writing 'niew' or 'euw' (dropping a vowel letter)

Wrong — it's nieuw (ie + uw) and -eeuw, with the doubled vowel kept.

✅ nieuw, leeuw, sneeuw

'new', 'lion', 'snow'.

Key Takeaways

oe = the "oo" of food, always, with no exceptions — the one vowel digraph English speakers already own. Keep it pure (boek, moeder, goed).
aai/ooi/oei/eeuw/ieuw = a long vowel + a quick glide; one syllable each (mooi, nieuw, eeuw, groei). Keep the doubled vowel in spelling: -eeuw, -ieuw.
-ig reduces to "-uhch" and -lijk reduces to "-luhk" in normal speech — both swallow their vowel into a schwa (gezellig, eindelijk).
-lijk is the cognate of English -ly but is not said "-like"; the visual cognate misleads the ear.
An unstressed ij (in -lijk) reduces, while a stressed ij stays a full diphthong — see both at once in waarschijnlijk.

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