This is the 17819th most frequent Polish word.
zwyczajnie
"Zwyczajnie" means "simply" or "ordinarily" in English.
In this sentence, 'zwyczajnie' is used to mean 'simply' or 'plainly', expressing that the action occurred in an ordinary, unproblematic manner.
Zwyczajnie zapomniałem zamknąć drzwi.
I simply forgot to close the door.
Here, 'zwyczajnie' serves to emphasize that the statement is straightforward or a matter of fact.
On zwyczajnie nie lubi herbaty, to wszystko.
He just doesn't like tea, that's all.
In this example, 'zwyczajnie' conveys a habitual action indicating regular or usual behavior.