外がい傷しょう的てき体たい験けん

• トラウマ

  トラウマ is a more common, casual term for psychological trauma, while 外傷的体験 is a formal, clinical expression.

• 心しん的てき外がい傷しょう

  心的外傷 is a direct synonym often used in medical contexts, but 外傷的体験 emphasizes the experiential aspect.

Compound of 外傷 (がいしょう, 'external wound') + 的 (てき, '-like') + 体験 (たいけん, 'experience'), literally 'external-wound-like experience', used figuratively for psychological trauma.