This is the 12724th most frequent Polish word.
niepowtarzalną
"Unique" or "unrepeatable."
In this sentence, 'niepowtarzalną' describes the kind of opportunity (szansę) that is unique and cannot be repeated, emphasizing its rare and special nature.
Miała niepowtarzalną szansę, aby zaprezentować się na międzynarodowej wystawie.
She had a unique opportunity to present herself at the international exhibition.
Here, 'niepowtarzalną' modifies 'moment,' referring to an extraordinary and unforgettable point in time.
To była niepowtarzalną moment, który na zawsze pozostanie w naszej pamięci.
It was a unique moment that will forever remain in our memory.
In this sentence, 'niepowtarzalną' describes the kind of adventure (przygodą) that is singular and distinctive, highlighting the novel experiences it brings.