Antonyms for the word "more well-planned" include "haphazard", "unplanned", "unsystematic", "random", "disorganized", "chaotic", "unscheduled", and "sporadic". These words describe actions or events that lack structure, organization, or a clear strategy. They suggest a lack of foresight and planning which can result in less effective outcomes. In contrast, "well-planned" implies a thoughtful and strategic approach that has been carefully executed. As such, antonyms for "more well-planned" may be used to criticize or highlight the deficiencies of a process, project, or decision.