Ill-prepared (adjective)

1. Not having made the necessary arrangements or taken the necessary steps in advance.
2. Not having the necessary knowledge, skills, or resources to undertake a task or deal with a situation.

Origin:

Compound of "ill" meaning bad or incorrect and "prepared" meaning having made the necessary arrangements or taken the necessary steps in advance.

Examples:

1. The team was ill-prepared for the competition.
2. The company was ill-prepared for the sudden change in market conditions.
3. The students were ill-prepared for the exam.
4. The ill-prepared speech was poorly received.
5. The ill-prepared plan resulted in a failure.