indefinite

Without limit; forever, or until further notice; not definite.

Your account will be suspended for an indefinite period of time.

A federal judge on Wednesday blocked the government from enforcing a controversial statute about the indefinite detention without trial of terrorism suspects.

Vague or unclear.

She gave an indefinite answer which nobody really understood.

Undecided or uncertain.

I'm still indefinite about what I'm going to study at college.

Being an integral without specified limits.

Don't forget to m the +C when calculating indefinite integrals.

Designating an unspecified or unidentified person or thing or group of persons or things.

the indefinite article

A word or phrase that designates an unspecified or unidentified person or thing or group of persons or things.