The antonym for purpose is ‘aimlessness’ or ‘meaninglessness’.
Purpose refers to the reason or intention behind an action, something that drives a person to achieve certain goals. On the other hand, when we talk about aimlessness, we’re referring to a lack of direction or intent. Similarly, meaninglessness conveys a sense of having no significance or purpose. Both terms highlight the absence of a motivating reason, contrasting sharply with the concept of purpose.