This is the 12691st most frequent Polish word.
nielicznych
"Of the few" or "few."
The word 'nielicznych' is used as an adjective meaning 'few' or 'sparse', modifying 'spacerowiczów' (walkers) to describe their small number.
W parku było tylko kilku nielicznych spacerowiczów.
There were only a few sparse walkers in the park.
Here, 'nielicznych' modifies 'dzieci' (children) to specify a limited number of children selected for the invitation.
Tylko nielicznych dzieci zaproszono na urodziny.
Only a few children were invited to the birthday party.
In this sentence, 'nielicznych' functions as an adjective describing 'odważnych' (brave men), indicating their rare or small number.