This is the 5528th most frequent Polish word.
ubiegłą
"Ubiegłą" means "last" or "previous" when referring to time (e.g., "last year").
The word 'ubiegłą' is used as an adjective modifying 'niedzielę' (Sunday), indicating 'last' or 'previous'.
Ubiegłą niedzielę spędziliśmy na spacerze po parku.
We spent last Sunday walking in the park.
Here, 'ubiegłą' is used to modify 'noc' (night), again indicating 'past' or 'previous'.
Ubiegłą noc przespałam bardzo dobrze.
I slept very well last night.
In this sentence, 'ubiegłą' modifies 'zimę' (winter), signifying 'last' or 'prior'.