noun-modifying (irregular)
systematic; methodical; organized
Describes something done or arranged according to a clear system or method; often used for research, thinking, or procedures.
He analyzed the problem in a systematic way.
If you study in an organized manner, you'll improve faster.
体系的 also means 'systematic' but emphasizes a structured system or framework, often used in academic contexts.
Standard spelling; the past-tense form of 系統立つ used as a prenominal adjective.
Alternate kanji spelling using 立つ; less common but still encountered.
From the past tense of the verb 系統立つ (to be systematic), used as a prenominal adjective. The kanji 系統 means 'system' or 'lineage', and 立つ here contributes the sense of 'standing' or 'being established'.