not having a strong taste or character, or having no interest or energy

a pale insipid wine 淡而无味的葡萄酒

He's an insipid old bore. 他是个无聊讨厌的老头子。

Why anyone buys music with such insipid lyrics is a mystery. 这些音乐的歌词索然无味，真不明白为什么会有人买。