The adjective insipid means something that doesn’t have a strong taste or energy.

Synonyms are banal, bland, innocuous, or vapid.

The word origins from Middle French (16th Century) insipide meaning “insipid”, and from Late Latin inspidus meaning “tasteless”. It comes from in- meaning “not” plus Latin sapidus meaning “tasty”, from sapere meaning “have a taste”. Figurative meaning “uninteresting, dull” was first recorded in English 1640s.

It tasted indescribably insipid and like warmed cardboard.

No one knows why they buy music with such insipid lyrics.

He is an insipid old bore in our first meet.