When given a problem or a decision, saying "I need to think about things" can be a way to buy time and process the situation. However, if you want to communicate this message more effectively, there are several synonyms that can help you express your need to reflect and consider options. You can say "I need to contemplate," "I need to mull over," "I need to ponder," "I need to deliberate," or "I need to weigh my options." Using these synonyms can show that you are actively trying to find a solution, rather than simply delaying the decision-making process.