Front Rounded Vowels: UU and EU

Dutch has two vowels that simply do not exist in English: uu (as in nu, vuur) and eu (as in deur, neus). They are front rounded vowels — your tongue is pushed forward as if for ee, but your lips are rounded as if for oo. English uses lip-rounding only for back vowels (oo, oh), so the combination of a front tongue with rounded lips is a genuinely new gesture for an English speaker. The good news is that there's a reliable production trick for each, and once you own the lip-rounding move, both sounds fall into place. This page covers only these two pure vowels; the oe of boek (which is just English oo) lives in OE and other vowel digraphs, and the diphthong ui of huis — which only looks related to uu — is in the diphthongs.

UU: say ie, then round your lips

The single most useful instruction for uu is this: say a Dutch long ie (the "ee" of niet), hold the tongue exactly where it is, and round your lips into a tight "oo" shape. The tongue must not move back — only the lips change. If you do this and nothing else, the sound that comes out is uu. It is the same vowel as French u (in tu) or German ü (in über).

EU: say the vowel of air, then round

For eu, start from a mid front vowel — the kind of "eh"/"er" sound in English air or bed, with the tongue a notch lower than for uu — and again round the lips. Dutch eu is the rounded partner of that mid front vowel (it matches French eu in peur / German ö in schön). The mouth is slightly more open than for uu, and the lips a touch less tightly pursed, but the principle is identical: front tongue, rounded lips.

Single u in a closed syllable is a different vowel

Watch out: a single u in a closed syllable — bus, dun, kunst, hut — is not the long uu. It's a short, central, lax vowel, close to the u of English put (in many accents) or the first vowel of about. It is unrounded or only weakly rounded, and short. This is exactly the short/long contrast covered in long and short vowels: one u in a closed syllable is short; two (uu) is the long front rounded vowel.

Drill that three-way contrast out loud — bus / muur / boer — until the three vowels feel clearly different. The first is short and central, the second is long with the tongue forward, the third is long with the tongue back. English speakers tend to collapse all three toward the back "oo", which makes muur sound like moer and bus sound like English bus.

The UU / UI trap

This is the trap that catches almost every learner, and most textbooks bury it. On the page, uu and ui look like close cousins — one u doubled, one u plus i. In the mouth they have nothing to do with each other:

• uu (muur, vuur) is a pure, steady vowel — the tongue and lips hold one position from start to finish.
• ui (huis, tuin) is a diphthong — a gliding sound that moves from one vowel position to another, with no English equivalent at all.

So vuur ("fire") and vuil ("dirty") are completely different vowels despite looking almost identical. Don't let the spelling fool your ear. The ui diphthong is covered in full in the diphthongs; here, just lock in that uu is one held vowel, never a glide.

Orthography: when it's u and when it's uu

The number of u letters follows the standard open/closed syllable rule (see open and closed syllables), and it can mislead you about the sound:

• In a closed syllable, the long front rounded vowel is written uu: muur, vuur, duur, uur.
• In an open syllable, the same long vowel is written with a single u: muren ("walls", mu-ren), dure ("expensive", inflected, du-re), uren ("hours", u-ren).

So muur and muren have the same long uu sound, written with two u's and one u respectively — exactly parallel to maan/manen for aa. A single u is only the short central vowel when its syllable is closed (bus, dun).

There's one more orthographic detail for eu. When e and u happen to meet across a morpheme or syllable boundary but should not be read as the eu digraph, Dutch puts a trema (¨) on the u to force a fresh syllable: reünie ("reunion") is re-u-nie, not "reu-nie", and reünie's relative museum is mu-se-um. The trema is the written signal that says "read these two vowel letters separately." (More on the trema in the trema and apostrophe.)

Common Mistakes

Key Takeaways

• uu = front tongue (as for ee) + rounded lips. Say "ee", then round, without moving the tongue. (nu, muur, vuur)
• eu = mid front vowel (as in air) + rounded lips. (deur, kleur, neus)
• A single u in a closed syllable (bus, dun) is a short central vowel, not the long uu.
• Drill the three-way contrast bus / muur / boer: short central, long front-rounded, long back-rounded.
• uu and ui are unrelated: uu is a pure held vowel, ui is a diphthong (vuur vs vuil).
• Spelling: long uu is written uu in a closed syllable (muur) but single u in an open one (muren); the trema in reünie forces a syllable break.