verstärkt
increased
Raised or intensified in intensity, number, or effect.
Die Polizei hat ihre Präsenz in der Innenstadt verstärkt.
The police increased their presence in the city center.

increased / reinforced
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increased
Raised or intensified in intensity, number, or effect.
Die Polizei hat ihre Präsenz in der Innenstadt verstärkt.
The police increased their presence in the city center.

'Verstärkt' (increased/reinforced) is the past participle of the verb 'verstärken' (to strengthen/reinforce). This verb is derived from the adjective 'stark' (strong). The prefix 'ver-' expresses here that something is being 'made stronger.'
Wir müssen unsere Anstrengungen verstärken, um das Projekt rechtzeitig abzuschließen.
We need to intensify our efforts in order to complete the project on time.
'Verstärkt' (increased/reinforced) can stand before a noun as an adjective and then means 'more intensive' or 'more robust.' It can also be used as an adverb and then means 'increasingly' or 'more frequently.'
Die Polizei führte verstärkte Kontrollen durch.
The police carried out increased checks.
As an adjective, 'verstärkt' (increased/reinforced) is often combined with nouns that describe an activity or a concept. Typical examples are 'verstärkte Maßnahmen' (increased measures), 'verstärkte Zusammenarbeit' (increased cooperation), or 'verstärkte Nachfrage' (increased demand).
Die beiden Firmen einigten sich auf eine verstärkte Zusammenarbeit.
The two companies agreed on increased cooperation.
increasingly / waxing
'zunehmend' and 'verstärkt' both describe that something is becoming more, happening more often, or becoming stronger. 'zunehmend' emphasizes development over time: something gradually becomes more. 'verstärkt' emphasizes more the greater strength, effect, or frequency, often because someone is deliberately doing more or because something is more intense. The words can be confused because both fit in sentences meaning 'it is happening more'. If you mean a slow increase, 'zunehmend' is very appropriate. If you mean a stronger effect or a deliberate increase, 'verstärkt' sounds more natural.

Nach dem Unfall kontrolliert die Polizei die Straße verstärkt.
After the accident, the police are monitoring the road more closely.
Sie fühlt sich zunehmend sicherer, weil sie jeden Tag übt.
She feels increasingly confident because she practices every day.