This is the 9910th most frequent Polish word.
anty
"Anty" in Polish means "anti-" or "against."
In this sentence, 'anty' is a prefix forming an adjective that means 'against allergies', describing the mattress's property.
Mój znajomy ma antyalergiczny materac.
My friend has an anti-allergic mattress.
Here, 'anty' is used as a prefix forming an adjective that conveys opposition or resistance to the state, describing actions.
Na wieczornym spotkaniu dyskutowali o antypaństwowych działaniach.
At the evening meeting, they discussed anti-state activities.
In this context, 'anty' forms an adjective indicating opposition to corruption, describing the theme of the poster.