na-adjective
supernatural; paranormal
Describes phenomena beyond normal scientific understanding, such as psychic abilities or paranormal events. Often used in formal or descriptive contexts.
彼は超常的な能力を持っていると主張している。
He claims to have supernatural abilities.
その事件は
The incident was treated as a paranormal phenomenon.
神秘的 means 'mysterious' or 'mystical', often with a sense of awe or hidden meaning, whereas 超常的 specifically refers to phenomena beyond normal scientific laws.
Compound of 超 (chō, 'beyond') + 常 (jō, 'ordinary') + 的 (teki, adjectival suffix). The exact historical derivation is uncertain, but the word follows a common pattern for forming adjectival nouns describing abstract qualities.