Insufficient (adjective)

1. Not enough; inadequate.
2. Not adequate to meet the needs or requirements.
3. Lacking the necessary qualities or resources to achieve a particular purpose.

Origin:

From the late middle english, from latin insufficient-, from in- meaning "not" + sufficient-, sufficiens meaning "sufficient". first used in the 15th century.

Examples:

1. The evidence is insufficient to prove his guilt.
2. The funds were insufficient to cover the expenses.
3. The food supply was insufficient to feed the entire population.
4. The information provided was insufficient to make a decision.
5. The company's profits were insufficient to meet its financial obligations.