This is the 15439th most frequent Polish word.
spontaniczne
"Spontaniczne" means "spontaneous" in English.
Here, 'spontaniczne' describes the nature of the outing as unplanned and impulsive.
Spotkaliśmy się na spontaniczne wyjście do kina.
We met up for a spontaneous movie outing.
In this sentence, 'spontaniczna' is an adjective describing 'reakcja,' highlighting immediacy and lack of premeditation.
Jej reakcja była absolutnie spontaniczna.
Her reaction was absolutely spontaneous.
The word 'spontaniczne' explains that the suggestions were made on the spot, without prior planning.