1) He approached the task in a haphazard and unsystematic manner.

2) She randomly selected study materials and reviewed them unsystematically.

3) The company's filing system is so unsystematic that it's hard to locate important documents.

4) Without a plan, he tackled the project unsystematically, resulting in delays.

5) The research was conducted unsystematically, leading to inconclusive results.

6) Students who study unsystematically tend to struggle with exams.

7) The team's approach to problem-solving was unsystematic and disorganized.

8) They gathered data unsystematically, making it difficult to analyze.

9) Her cleaning routine was unsystematic, resulting in a cluttered living space.

10) The committee's decision-making process seemed to be guided unsystematically by personal opinions rather than facts.