"性格保守"可以翻譯為 "conservative personality" 或 "reserved personality"。這兩個表達都可以用來描述一個人傾向于謹慎、傳統或不輕易冒險的性格特徵。例如：
- She has a conservative personality and prefers to stick to familiar routines.
- His reserved personality makes him cautious about trying new things.
根據具體語境，選擇合適的表達方式即可。