Unable to be predicted.
It has, therefore, always been a major problem for South African railways to cater adequately for this unpredictable city; three stations have had to be built on the present site during the last fifty years.
An unpredictable thing.
Other unpredictables, like the recent unexpected blizzards and those of 2 years ago, or a hurricane can cost us many thousands of dollars, and have a severe impact on equipment and facilities.
From un- + predictable.
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