There are countless synonyms for the phrase "was sick of", ranging from mild irritation to absolute disgust. One could say they were fed up, weary, or bored with something. Alternatively, they might be heartily sick of it, jaded, or disenchanted. Other options include annoyed, irritated, peeved, or vexed. If the situation has dragged on for a long time, they may be exasperated or frustrated. Or, if the issue is more serious, they might feel repulsed, disgusted, or even nauseated. Whatever the specific word used, each conveys a powerful sense of annoyance or disillusionment, indicating a deep desire for change and relief.