When it comes to expressing awareness or understanding of something, there are many synonyms for the phrase "be sensible of." One option is "to be cognizant of," which emphasizes a level of knowledge and recognition. Another possibility is "to be mindful of," which emphasizes a sense of intentionality and attention. "To be aware of" is a straightforward alternative, indicating a basic recognition of something. "To take note of" suggests active observation and consideration. Additionally, "to comprehend" implies a deeper level of understanding and even mastery of a subject or concept. Ultimately, the right synonym will depend on the specific context and desired tone.