There are several synonyms for the phrase "were tough" which conveys the same meaning but with slight variations. For instance, the phrase "were challenging" denotes a more rigorous or difficult experience, which one had to overcome. Another synonym could be "were demanding"; meaning the task or situation required a high level of effort, skill or perseverance to accomplish it. Additionally, the phrase "were formidable" implies a sense of intimidation or fear. This term might be used to describe a challenge or obstacle that seemed insurmountable at first glance. All told, it is evident that the English language has numerous synonyms for the phrase "were tough," each communicating a slightly different feeling or emphasis.