unsystematic
🇺🇸
/ˌʌnˌsɪstəˈmætɪk/
🇬🇧
/ˌʌnˌsɪstəˈmætɪk/
not following a clear plan or method
Her unsystematic approach to studying made it difficult for her to retain information.
她不系统的学习方法使她难以记住信息。