Occurring at a relatively large but unspecified position in a series.
Occurring at position n in a sequence.
The item at position n in a sequence.
The item in a relatively large but unspecified position in a series.
Unpredictable or capricious.
Not certain; unsure.
Not yet determined; undecided.
Variable and subject to change.
Fitful or unsteady.
Not known for certain; questionable.
Something uncertain.