
rapide
rapidly
Happening very quickly and within a short time; taking place rapidly. Often used to describe a change.
Die Zahl der Nutzer ist in den letzten Wochen rapide angestiegen.
The number of users has risen rapidly in recent weeks.
rapid
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rapidly
Happening very quickly and within a short time; taking place rapidly. Often used to describe a change.
Die Zahl der Nutzer ist in den letzten Wochen rapide angestiegen.
The number of users has risen rapidly in recent weeks.
The word 'rapide' (rapidly) is almost always used as an adverb to describe a verb of change. It then stands directly with the verb and is not declined.
Die Technologie hat sich in den letzten Jahren rapide entwickelt.
Technology has developed rapidly in recent years.
'Rapide' (rapidly) describes a fast change. It is often combined with verbs such as 'ansteigen' (to rise), 'sinken' (to fall), 'wachsen' (to grow), 'abnehmen' (to decrease), or 'sich verschlechtern' (to worsen).
Die Zahl der Arbeitslosen ist im letzten Quartal rapide gesunken.
The number of unemployed people fell rapidly in the last quarter.
'Rapide' (rapidly) is a word used in written language or a more formal style. It is often found in news reports, reports, or academic texts.
Der Zustand des Patienten verschlechterte sich rapide.
The patient's condition worsened rapidly.
fast / quick
Schnell can generally be used for processes, actions, and movements. Rapide describes something that happens very quickly and is used especially for changes. When there is a major change in a very short time, rapide is appropriate; otherwise, schnell is usually sufficient.

Die Preise stiegen innerhalb weniger Tage rapide an.
Prices rose rapidly within a few days.
Die Preise stiegen in diesem Jahr schnell an.
Prices rose quickly this year.