This is the 5555th most frequent Spanish word.
pobres
Poor (plural).
Here, 'pobres' refers to economically disadvantaged people collectively.
Los pobres merecen apoyo y comprensión.
The poor deserve support and understanding.
In this context, 'pobres' acts as an adjective describing the quality of the 'solutions' as inadequate or unsatisfactory.
Estas soluciones pobres no me convencen.
These poor solutions do not convince me.
Here, 'pobres' expresses sympathy or compassion for the 'children' due to their situation of playing in the rain.