sorry. what does " lost in life" mean ? For example, " I have lost interest in life." in this case, It's said "欲を失う". "lost emotionally" is said "感情を失う" in Japanese. btw, "lost in thought" is said "思いにふける" in Japanese. "lost" mean the same as "失う" in Japanese. 迷子 mean the same as "道を失う".