There are several synonyms for the word "hard lives". Some of the commonly used synonyms are tough lives, difficult lives, challenging lives, harsh lives, arduous lives, strenuous lives, and demanding lives. All of these synonyms suggest that the people who are living such lives are facing hardships and difficulties on a daily basis. These hardships may include financial struggles, health problems, emotional difficulties, or any other type of hardship that makes life difficult. Regardless of which synonym is used, they all convey a sense of struggle and difficulty, and they all highlight the strength and resilience it takes to live through hard times.