When it comes to being concerned with something, it's important to have a range of synonyms available to diversify your language usage. Some synonyms for the phrase "was concerned with" include "paid attention to," "focused on," "had an interest in," "took responsibility for," "devoted energy to," "took care of," and "had a vested interest in." Using these alternative phrases in lieu of "was concerned with" can add depth to your writing or conversation, as well as make it more engaging for the listener or readers. Ultimately, expanding your vocabulary can help increase precision and clarity in communication.