The word "biest" refers to a beast or a wild animal. When looking for antonyms for this term, one could consider words that describe calmness, gentleness, and domestication. Words like "pet," "companion," and "tame" are all antonyms for "biest." Other antonyms may include "docile," "placid," "mild," and "domesticated." These words describe animals that are submissive, trained, or otherwise under human control. While the word "biest" may conjure up images of ferocity and wildness, its antonyms bring to mind peace, serenity, and warm companionship.