Insipid (adjective)

Lacking in taste or flavor; dull or uninteresting.

Origin:

Insipid is derived from the latin word "insipidus" meaning tasteless, dull or lacking in interest.

Examples:

1. The soup was insipid and lacked any discernible seasoning.
2. The conversation was insipid, and she found it difficult to keep her attention on it.
3. The movie was insipid and failed to capture the audience's attention.
4. The drink was insipid and needed more sugar.
5. The lecture was insipid and the students found it difficult to stay awake.