This is the 8472nd most frequent Polish word.
poniedziałkowy
"Poniedziałkowy" means "Monday-related" or "pertaining to Monday."
The word 'poniedziałkowy' is used as an adjective modifying 'poranek', meaning a morning associated with Monday.
W poniedziałkowy poranek padał deszcz.
On the Monday morning, it was raining.
Here 'poniedziałkowy' describes 'mecz', indicating it is a match that occurred on Monday.
To był poniedziałkowy mecz piłki nożnej.
It was a Monday football match.
'Poniedziałkowy' qualifies 'nastrój', suggesting a mood characteristic of or occurring on Monday.