Antonyms for the phrase "was sensible of" may vary depending on the context in which it is used. However, some possible antonyms include "unaware of," "ignorant of," "unfeeling," "insensitive," and "oblivious to." These terms suggest a lack of awareness or understanding of a particular situation or feeling, indicating a failure to recognize or acknowledge its significance. Thus, antonyms for "was sensible of" may convey a sense of indifference, indifference, or disinterest. It is essential to choose the right words and phrases to express one's thoughts and feelings effectively, and selecting antonyms for "was sensible of" can help to convey a different mood or tone in writing or speech.