immerzu
constantly
Expresses that something happens without a pause or interruption; continuously, all the time.
Das Baby weinte immerzu, bis es seine Milch bekam.
The baby cried constantly until it got its milk.

constantly
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constantly
Expresses that something happens without a pause or interruption; continuously, all the time.
Das Baby weinte immerzu, bis es seine Milch bekam.
The baby cried constantly until it got its milk.

'Immerzu' (constantly) is an intensification of 'immer' (always). The addition 'zu' emphasizes that an action really takes place without any interruption.
Während des Films hat mein Nachbar immerzu geredet.
During the film, my neighbor talked constantly.
As an adverb, 'immerzu' (constantly) usually appears in the middle part of the sentence, after the conjugated verb and the subject. It does not change the basic sentence structure.
Er schaut beim Arbeiten immerzu auf sein Handy.
He keeps looking at his phone constantly while working.
This word often expresses emotional involvement, such as annoyance, surprise, or even admiration about the ongoing action. It is very common in spoken language.
Sie musste über den Witz immerzu lachen.
She had to keep laughing constantly at the joke.
always
'immer' and 'immerzu' can both express that something happens constantly. 'immer' is the normal, very general word for 'at all times' or 'every time'. 'immerzu' puts stronger emphasis on something continuing without a pause, often in a way that is noticeable or annoying. Learners may confuse the words because they sound very similar and overlap in some sentences. In everyday use, 'immer' is usually more neutral and flexible; 'immerzu' is especially suitable when an action keeps going continuously.

Im Wartezimmer redet der Fernseher immerzu im Hintergrund.
In the waiting room, the TV keeps talking in the background.
Er kommt immer pünktlich zur Besprechung.
He always arrives on time for the meeting.