
ständig
constant
Continuing without interruption or repeating at short intervals; continuous or very frequent.
Der ständige Lärm von der Straße macht mich nervös.
The constant noise from the street makes me nervous.
constant
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constant
Continuing without interruption or repeating at short intervals; continuous or very frequent.
Der ständige Lärm von der Straße macht mich nervös.
The constant noise from the street makes me nervous.
The word 'ständig' (constant/constantly) is derived from the verb 'stehen' (to stand). The basic idea is that something 'stehen bleibt' (stays in place) and does not change, so it is permanent or ongoing.
Wir stehen in ständigem Kontakt.
We are in constant contact.
'Ständig' (constant/constantly) can stand as an adjective before a noun or as an adverb describing a verb. The form of the word does not change in this use.
Der ständige Regen ist deprimierend.
The constant rain is depressing.
Although 'ständig' (constant/constantly) can be neutral, it is very often used to express annoyance or frustration about something that repeats frequently and is disturbing.
Mein Nachbar hört ständig laute Musik.
My neighbor is constantly listening to loud music.
always
Immer and ständig can describe frequently repeated actions. Immer emphasizes that the action happens on every relevant occasion; ständig highlights a very high frequency or almost continuous repetition and can sound annoyed.

Paul unterbricht mich ständig, während ich das Problem erkläre.
Paul constantly interrupts me while I am explaining the problem.
Paul unterbricht mich immer, wenn ich das Problem erkläre.
Paul always interrupts me when I explain the problem.