Etymology
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indefinite (adj.)

1520s, "not precise, vague," from Latin indefinitus "indefinite," from in- "not, opposite of, without" (see in- (1)) + definitus, past participle of definire (see define). In reference to number, "The term was introduced by Pascal. Descartes distinguished between the indefinite, which has no particular limit, and the infinite which is incomparably greater than anything having a limit. The distinction is considered as highly important by many metaphysicians." [Century Dictionary]

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Definitions of indefinite

indefinite (adj.)
vague or not clearly defined or stated;
amorphous blots of color having vague and indefinite edges
he would not answer so indefinite a proposal
must you be so indefinite?
indefinite (adj.)
not decided or not known;
plans are indefinite
were indefinite about their plans
From wordnet.princeton.edu