The word "under-taken" means to accept or take responsibility for a task or project. Its antonyms, or words with opposite meanings, include "decline," "refuse," "shirk," and "avoid." When someone declines a task, they choose not to accept or take responsibility for it. Refusing means to reject the task outright. Shirk means to avoid or neglect the responsibilities altogether. Finally, avoid means to take steps to prevent the task from coming to oneself in the first place. Knowing these antonyms can help you understand how people respond to responsibility in different ways.