immediate
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immediately
Without culpable delay; as quickly as possible under the given circumstances. The term is often used in formal, official, or legal contexts and means 'sofort' (immediately).
Ein Schaden am Fahrzeug muss der Versicherung unverzüglich gemeldet werden.
Damage to the vehicle must be reported to the insurance company immediately.
The word is made up of 'un-' (not), 'Verzug' (delay), and the ending '-lich'. So it literally means 'without delay'.
Die Zahlung muss ohne Verzug erfolgen.
Payment must be made without delay.
'Unverzüglich' (immediately/without delay) is a formal word used mainly in official, legal, and business language. In everyday conversation with friends, it sounds unnaturally stiff.
Bitte informieren Sie uns unverzüglich über jegliche Änderungen Ihrer Adresse.
Please inform us immediately of any changes to your address.
'Unverzüglich' (immediately/without delay) is usually used as an adverb that further specifies an action. It emphasizes that something must happen without culpable hesitation and as quickly as possible.
Sie müssen sich nach Ihrer Ankunft unverzüglich beim Amt melden.
You must report to the office immediately after your arrival.
fast / quick
'schnell' and 'unverzüglich' can both express that someone should not wait long. 'schnell' is the normal everyday word and can also simply mean that something happens quickly. 'unverzüglich' is much more formal and means: as soon as possible, without culpable delay. You often find it in letters from authorities, in contracts, or in important professional situations. In normal conversations, 'unverzüglich' often sounds too strict.
Der Unfall muss unverzüglich der Versicherung gemeldet werden.
The accident must be reported to the insurance company immediately.
Wir bezahlen die Rechnung schnell, damit es keine Mahnung gibt.
We pay the bill quickly so there won’t be a reminder.