
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.

increasingly
Used adverbially to express that something is happening increasingly or more frequently.
In letzter Zeit treten verstärkt Probleme mit der Software auf.
Recently, problems with the software have been occurring increasingly often.
'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
Both words can express more or more intense activity. „Zunehmend“ emphasizes that it continues to increase over time. „Verstärkt“ tends to describe an intensity or frequency that has already been increased and can also express a deliberate intensification after a particular event.

Nach dem Unfall kontrolliert die Polizei die Straße verstärkt.
After the accident, the police are monitoring the street more intensively.
Wegen der vielen Beschwerden kontrolliert die Polizei die Straße zunehmend.
Because of the many complaints, the police are monitoring the street more and more.