Indefinite (adjective)

1. Not precise or exact, not limited or determined.
2. Not having a fixed or specified length of time or duration.
3. Not having a specific identity or purpose.

Origin:

From late latin indefinitus, from latin in- ("not") + definitus ("determined, defined"), past participle of definire ("to determine, defin.e")

Examples:

1. The deadline for the project was left indefinite because the client did not provide sufficient information.
2. The weather forecast for the weekend is indefinite and may change.
3. He took an indefinite leave of absence from work to take care of his family.
4. The company offered him an indefinite contract, which gave him more job security.
5. The experiment produced indefinite results that were difficult to interpret.