Her superstitious belief that walking under a ladder brings bad luck makes her always detour around it.

superstitious 是由名词 superstition（迷信）加上形容词后缀 -ious 构成的形容词，表示"迷信的"。superstition 由前缀 super-（表示"超过"）和词根 stit（来自拉丁语 stare，意为"站立"）组成，字面意思是"超越理性的坚持"，即"迷信"。