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A antonym for windbreak could be free
free
free will
The antonym of full price is discounted price.
Free Person
free
free
To free or unfasten.
free person
Synonyms for unbridled are wild and free. An antonym for unbridled is restrained.
An antonym for phosphorus could be something like "phosphorescence" or "phosphorus-free."
impose means force something to be done. So the antonym would be freedom or free