This is the 10973rd most frequent Catalan word.
senzills
Simple or easy.
Here, 'senzills' is used as an adjective meaning 'simple' or 'easy' to describe 'instruccions'.
Aquestes instruccions són senzills de seguir.
These instructions are simple to follow.
In this sentence, 'senzills' is used as an adjective meaning 'plain' or 'not fancy' to describe the appearance of 'pantalons'.
Porto uns pantalons senzills avui.
I'm wearing plain pants today.
Here, 'senzills' describes 'gestos', emphasizing their nature as small and modest actions.