na-adjective
Describes music, art, fashion, or experiences with vivid colors, surreal patterns, or hallucinatory effects, often associated with 1960s–70s counterculture.
彼はサイケデリックな音楽が好きだ。
He likes psychedelic music.
壁にサイケデリックな模様が描かれている。
A psychedelic pattern is painted on the wall.