個こ人じん的てき

私し的てき
私的 also means 'private' but often emphasizes a contrast with official or public capacity, while 個人的 focuses on the individual person's own view or matter.
プライベート
プライベート is a casual loanword for one's private life or free time, while 個人的 is more formal and typically used for opinions, reasons, or personal matters.
パーソナル
個人的 is the native Japanese word for 'personal/individual' and fits formal or written contexts, while パーソナル is a loanword often used in product names and casual speech.
私し事じ
個人的 is a na-adjective meaning 'personal' or 'individual' used to describe opinions or preferences, whereas 私事 is a noun naming a private matter itself.

Opposites

公こう的てきN1
公的 describes something official or public, the direct opposite of 個人的, which describes something belonging to an individual.
社しゃ会かい的てきN3
社会的 describes things concerning society as a whole, while 個人的 describes things concerning a single individual.
組そ織しき的てき
組織的 describes actions coordinated by a group, whereas 個人的 describes actions taken by an individual acting alone.

個こ別べつN1
個別 means 'individual' in the sense of treating things separately or case-by-case, whereas 個人的 means 'personal' as belonging to a specific person; the two share the kanji 個 but differ in meaning.
個こ人じんN3
個人 is the noun 'individual/private person', while 個人的 is the na-adjective 'personal, subjective' used to describe opinions or feelings.

Formed from 個人 “individual” and the adjectival suffix 的, a Sino-Japanese use modeled on Chinese 的.