Translation

陳腐な / 平凡でつまらない / ありきたりな

Meaning

Banal means boring because something is too ordinary, predictable, or overused. It is a critical word for comments, slogans, plots, advice, and design. Do not confuse it with plain, which can be neutral or positive.

Examples

• その映画は映像は美しいが、会話は陳腐だった。
  The film looked beautiful, but the dialogue was banal.
• 彼の助言は親切だったが、かなりありきたりだった。
  His advice was kind but rather banal.