Inconsistent learning can be frustrating, which is why it's important to seek out synonyms for "study at inconstant." One alternative is "learn erratically," which implies a lack of consistency. Another option is "acquire knowledge sporadically," which suggests that one is gaining knowledge bit by bit but in an unorganized fashion. "Unsystematic study" also conveys the idea of irregularity in one's learning process. Finally, "haphazard learning" speaks to a sense of randomness in the acquisition of knowledge. Regardless of which synonym one chooses, it's clear that effective study habits require commitment and consistency in order to truly succeed.