The word "prevented" means to stop something from happening, so its antonyms would be words that describe the opposite action. Some possible antonyms for "prevented" include "allowed," "permitted," "let," "encouraged," "facilitated," "enabled," and "assisted." These words suggest actions that promote or enable a particular outcome, rather than stopping it. While preventing something can be important in some situations, enabling or facilitating can be just as important in others. The use of antonyms is important to convey the opposite meaning of a word, and to expand our vocabulary to better express our thoughts and ideas.