Unsatisfying (adjective)

1. Not fulfilling or gratifying.
2. Disappointing or lacking in satisfaction.

Origin:

From the latin word 'insatisfactus' meaning 'not satisfied or content'.

Examples:

1. The movie was unsatisfying and lacked a proper ending.
2. The meal was unsatisfying and lacked flavor.
3. The job was unsatisfying and lacked growth opportunities.
4. The book was unsatisfying and lacked depth.
5. The relationship was unsatisfying and lacked communication.