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1. Origins, structure, and basic meaning

• Structure: The on reading is ずい, and the kun reading is したがう. It has 12 strokes. It appears in words for expressions for timing and degree.
• Basic usage: 随時 is read ずいじ and 随分 is read ずいぶん.

2. Common pitfalls and similar expressions

• 随時 / 随分
  • 随時 means at any time or as needed and is read ずいじ. It indicates doing something at any time or as needed, such as accepting questions or updating information.
  • 説明の途中でも質問は随時受け付けます。 means “Questions are welcome at any time, even during the explanation.”
  • 随分 means considerably or very and is read ずいぶん. It indicates that a duration or degree of change is considerable.
  • 随分長い間、彼とは会っていない。 means “I have not seen him for quite a long time.”