Answer: indefinite

AnswerCrossword Clue
INDEFINITENot exact
INDEFINITEVague.
INDEFINITENot certain
indefiniteNot clearly expressed or defined; vague
indefinite(of a word, inflection, or phrase) Not determining the person, thing, time, etc., referred to
indefinitea thing which is not definite
indefiniteLasting for an unknown or unstated length of time