The antonym for the phrase "more thought about" can be "less considered." It implies that something hasn't been given much thought or attention. Other antonyms for "more thought about" include "neglected," "ignored," "casual," or "unremarkable." These terms suggest that an idea or concept has been overlooked, dismissed or taken lightly. When someone says something, but it hasn't been "more thought about," it means that they haven't spent enough time reflecting or analyzing their words, actions, or decisions. To avoid misunderstandings or confusion, it's essential to give adequate thought and consideration to the things that matter.