na-adjective
Describes something related to psychology, such as a perspective, approach, or phenomenon.
彼の行動を心理学的に分析する。
Analyze his behavior from a psychological perspective.
心理学 is the noun 'psychology'; 心理学的 is the adjectival form meaning 'psychological'.
Derived from 心理学 (psychology) + 的 (adjectival suffix).